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Fixed: Air Only Blows Out Of Defrost And Floor (With Pictures)


Are you having trouble with your vehicle’s AC? Does air only blows out of defrost and floor? Well, this is a problem that many car owners have. Over time, some of the vents simply stop blowing air. The reason behind this is a small component of the HVAC system which is easy to replace.

In this blog post, I will be talking about why your vehicle blows air only out of defrost and floor and how to fix it.

What Does a Blend Door Actuator Do?

Blend door actuators control the air and temperature blending and the direction of airflow. The blend door actuators have gears that are rotated by a small motor that moves doors in the HVAC incrementally between 90 and 180 degrees to reach desired air and temperature flow.

The blend door actuator is controlled by the vehicle’s climate controls. Blend door actuator can open and close at various positions to block or allow air to pass through the heater core in order to achieve the desired temperature inside the vehicle.

The mode door actuator controls which vent or vents air blows through. The door on the actuator has two positions: closed and open. The recirculation door actuator allows air inside of the passenger cabin to be recirculated through the A/C system, cooled or heated, and recirculated back into the cabin rather than ambient air.

Fixed: Air Only Blows Out Of Defrost And Floor (With Pictures)

 Only Blows Out Of Defrost And Floor

If air blows out of defrost and floor in your vehicle, there is probably something wrong with the blend door actuator. Here is a very detailed guide on how to test the blend door actuator and fix a vehicle that has air blowing out of defrost and floor only:

1. Required materials for the job

  • New blend door actuator
  • Cabin air filter
  • 5.5-millimeter socket
  • Multimeter
  • Safety gloves and goggles

2. Diagnose a bad blend door actuator

Before you replace a bad blend door actuator, you will need to diagnose it and make sure it is bad. Each time you try to select the temperature inside the cabin, or to select which vent to blow air, the computer sends a signal to the blend door actuator. The blend door actuator then redirects the airflow to the selected vent with the correct temperature.

So, each time you choose the temperature or the vent, the blend door actuator engages. A bad blend door actuator will actually only allow air to blow out of certain vents. The temperature may also be incorrect. Also, the best way to actually diagnose a bad blend door actuator is to listen to it. Each time you start your vehicle and turn on the AC, you can hear a squeaking/whining, popping, or clunking noise coming from the dashboard.

3. Order a new blend door actuator

Once you have established that your blend door actuator is bad, it is time to replace it. So, a brand new actuator costs around $30, depending on your make and model. You can either order a new blend door actuator on amazon.com or at your local auto part store. Either way, just make sure that the new blend door actuator is actually compatible with your vehicle.

4. Locate the blend door actuator

The blend door actuator is usually located on the driver’s side, underneath the steering wheel. It might be located in a different spot, depending on your vehicle. So, it is probably best if you check the owner’s manual to see where the blend door actuator is located on your vehicle.

However, as I said, it is probably underneath the steering wheel. It is a little bit hard to reach, so you might need to remove the plastic panel right above the gas pedal and underneath the steering wheel. The key here is to gain as much access as possible in order to remove it.

5. Disconnect the wiring harness connector from the blend door actuator and test it

Before removing the blend door actuator, it is best if you remove the wiring harness connector and test if the current is running through it and powering the blend door actuator. Sometimes the electrical wiring fails and isn’t sending enough power into the blend door actuator.

Turn on your multimeter and set it to 20 DCV. On the bottom left side, there is a green/black port which is always going to be negative, and right next to it there is a yellow/black port which is positive. Turn the key into an on position and first test the negative connection and then the positive connection. The voltage rating should be between eight and twelve volts on both connections.

6. Remove the faulty blend door actuator

After you successfully diagnose that the wiring is alright, it is time to remove the faulty blend door actuator. The blend door actuator is usually secured in place by 3 bolts size 5.5-millimeters. So, grab a 5.5-millimeter socket and remove the bolts. After you remove the bolts, you will be able to pull out the blend door actuator.

7. Install the new blend door actuator

Install the new blend door actuator and secure it in place with the three bolts that you removed from the faulty actuator. Then, reconnect the wiring. Make sure that you connect it all the way. After the blend door actuator is secured and connected, reinstall any plastic covers that you had to remove in order to gain access.

9. Install the new cabin air filter

air only blows out of defrost and floor

A high-quality cabin air filter removes dust, pollen, soot, exhaust fumes, unpleasant odors, and even fine particulate dust from the interior air in the vehicle. It also improves air circulation and prevents dangerous fogging of the windows.

However, the cabin air filter performs another important function. In addition to improving the quality of the air entering the vehicle, the cabin air filter reduces the load on the blower and protects the HVAC system from contamination by keeping dirt, debris, bugs, and leaves out of the evaporator and the heater core.

When the filter element becomes clogged, it restricts the airflow through the heater in the air conditioner. When the air intake is restricted, it’s going to decreases the volume of warm air that the heater can blow into the cabin. In the summer, it can have the same effect on the air conditioner. That’s not a good situation for the HVAC system because it forces the heater and air conditioner to work harder depending on whether you want warm or cool air. 

Basically, a dirty cabin air filter can restrict airflow to certain vents. Many car owners change their cabin air filters twice a year. However, depending on where you live, you might need to change the cabin air filter more often. It is always a good idea to change the cabin air filter when you replace the blend door actuator just to be safe.

9. Test the AC

At this point, you should be able to change the vents and the temperature of the AC. Before, if your AC blew only on defrost, or on the floor, now, it should blow on all vents, including the dashboard vents. So, start your vehicle and change the AC settings, temperature, and vents.

Why Does My Air Only Work On Defrost?

The AC in your vehicle only works on defrost because the blend door actuator has failed and got stuck into a position where it only allows air to flow on defrost vents. When you turn on the AC and set the desired vent and temperature, the blend door actuator engages and opens and closes vents accordingly. However, when a blend door actuator fails and locks up, air will not come out of some vents simply because the gears inside the blend door actuator got broken and will not open and close the vents.

The blend door actuators are designed to last the lifetime of the vehicle. However, most of them break after 70,000 to a 100,000 miles.

The blend door actuator has a board, connector, a motor that drives it, a drive gear, transfer gear, and an output shaft. The problem with all blend door actuators comes from the drive gear and transfer gear. They are made so small with little plastic teeth on them and they need to be moving a big door inside the HVAC case. That tough role, combined with key cycles makes them fail. Basically, if you open up a blend door actuator, the only thing that will be broken is the drive and transfer gear.

Why Does EGR Valve Get Carbon Build Up On a 6.0 (Answered!)


If you are a proud 6.0 Powerstroke owner, you might see the P0401, P0402, and P0404 codes more often than other car owners. This is why many Ford owners ask why does the EGR valve get carbon build up on the 6.0 so often.

In this blog post, I am going to talk about why does the EGR valve get carbon build up on a 6.0 and how to clean the EGR valve.

Why Does EGR Valve Get Carbon Build Up On a 6.0

Why Does EGR Valve Get Carbon Build Up On a 6.0

One of the main reasons for the EGR valve on 6.0 getting carbon buildup is due to the fact that these systems were not designed keeping in mind today’s driving conditions. Earlier, most people used their vehicles only for short distances which did not give the engine enough time to reach its optimum operating temperature. This led to incomplete combustion of the fuel which in turn resulted in soot (unburned carbon) being deposited on the EGR valve and other engine parts.

The EGR valve takes exhaust gasses that are high in nitrous oxides and sucks them back into the engine. It actually cools the combustion chamber and allows the engine to run better.

Another reason for carbon buildup on a 6.0 is the use of low-quality fuels. These fuels have a higher carbon content and do not burn completely, leaving behind a residue that gets deposited on the EGR valve.

The incorrect timing of the EGR system can also be a reason why the EGR valve gets carbon buildup. If the EGR system opens too early, before the engine has reached its optimum operating temperature, it can lead to incomplete combustion and carbon buildup. Similarly, if it opens too late after the engine has reached its maximum temperature, it can lead to overheating and damage to the engine.

The presence of oil in the exhaust gas can also lead to carbon buildup in the EGR valve. This can happen due to two reasons; either due to an oil leak in the engine or due to incorrect valve clearance. Oil in the exhaust gas will coat the EGR valve and other engine parts, leading to carbon buildup.

How To Clean an EGR Valve on a 6.0

Why Does EGR Valve Get Carbon Build Up On a 6.0

Cleaning the EGR valve on a 6.0 or any other vehicle is much cheaper than actually replacing the EGR valve every time it gets clogged by carbon. So, each time you get a P0401, P0402, and P0404 trouble code, first clean the EGR valve and see if that fixed the issue. Here is how to clean an EGR valve on a 6.0.

1. Required tools for the task

  1. Wire brush (view on amazon.com)
  2. Liquid EGR valve cleaner (view on amazon.com)
  3. EGR valve o-ring kit (view on amazon.com)

2. Open the hood and locate the EGR valve

With the engine cooled down, open the hood and locate the EGR valve. The EGR valve on a 6.0 is located behind the air intake elbow, between the alternator and the oil filter housing. It has a round shape and is equipped with an electrical connector on top of it.

3. Remove the EGR valve

Why Does EGR Valve Get Carbon Build Up On a 6.0

First, disconnect the electrical connection and set it aside. The EGR valve is secured by two bolts which can be removed with a 5/16” and an extension. Safely store the two bolts for later. If you are clumsy like me, loosen the bolts almost to the end and then grab them with pliers. In order to remove the EGR valve, you need to pull it straight upwards. Depending on how bad the carbon build-up is, you might have to wiggle it a little bit.

4. Clean the EGR port

Why Does EGR Valve Get Carbon Build Up On a 6.0

Cleaning the port inside the actual intake where the EGR valve sits is as much important as cleaning the EGR valve itself. This is where all of the EGR flow comes from. If your EGR valve has carbon build-up, there is a great chance that the port itself has carbon build-up too.

If you leave the port dirty, all of the carbon build-ups will simply end up in the cleaned EGR valve and will cause it to fail soon.

So, grab a spatula or something that is not too pointy and scrape the walls of the port. Try to get as many deposits as you can. As you scrape them, the deposits will fall down the port, but do not worry. After you are done scraping, you will vacuum them. Make sure you get all of the deposits or else you will have a crank no start upon completion of this repair.

5. Remove the O-rings and the gasket from the EGR valve

The EGR valve has two o-rings and a gasket that seals the EGR valve to the intake manifold. It is always a good idea to remove the old ones because they are going to be dry rotted from all of the carbon. So, grab a screwdriver and remove the two o-rings and the gasket.

6. Remove the large carbon deposits from the EGR valve

The carbon build-up on the EGR valve causes it to trigger P0401, P0402, and P0404 trouble codes because it is unable to come back to the home position or get stuck and not be able to open all the way. Either way, carbon is the issue.

Make sure that you are wearing gloves because these carbon deposits will stain your hands for a week. First, start by removing any loose chalky carbon with a screwdriver. Be careful not to damage any of the components. Next, grab a wire brush and try to clean any left carbon deposits before spraying it with a carbon cleaner.

7. Soak the EGR valve into the liquid cleaner

There are a lot of EGR valve cleaners on the market. They can either be spray or liquid. I always get the liquid one because I like to soak in the EGR valve because that way it can get cleaned really well. What works for me, and will work for you too, is a kitchen measuring cup. The reason why the measuring cup is perfect is that we don’t want to soak in the EGR valve completely. There are ports that we exposed when removing the gasket which shouldn’t be sprayed or submerged as well as the electronics on top of the EGR valve.

So, fill the kitchen measuring cup with the liquid carbon cleaner and put the EGR valve in it. The little ears on the EGR valve will hold it exactly where it should and won’t allow for the ports to get wet. Leave it to soak for at least half an hour and it will dissolve all of the remaining carbon build-up.

Depending on how bad your EGR valve is clogged, you can remove it from the cleaning solution and brush it with a wire brush and then let it sit again. When done, wipe the EGR valve with a clean towel and let it dry for about thirty minutes.

8. Install the new o-rings and gasket

After the EGR valve is cleaned and completely dry, you need to install the two o-rings and one gasket. The new o-rings are made from rubber and are pretty flexible, so getting them on the EGR valve is pretty easy. The same goes for the gasket that sits on top.

9. Reinstall the cleaned EGR valve

With the new o-rings and gasket installed, it is time to reinstall the EGR valve. Place it back into the port and line up the holes so you can insert the bolts. Tighten them down evenly on both sides, little by little. The spec on the EGR valve bolts is 120-inch pounds. Then, reconnect the electrical connector and make sure it snaps all the way in.

How To Replace The EGR Valve On Ford Mustang (2000-2015)


Are you a 2000 – 2015 Ford Mustang owner with a faulty EGR valve? I am sorry to hear that your EGR valve is faulty. However, I have some good news for you. Instead of spending up to $500 on having a mechanic replace your EGR valve, you can do it yourself and save a ton of money.

In this blog post, I will be talking about what the EGR valve is used for in vehicles and how to replace the EGR valve in the 2000 – 2015 Ford Mustang.

What is The EGR Valve Used For In Vehicles

The EGR stands for exhaust gas recirculation and is used to reduce nitrogen oxide emissions from vehicles. EGR is currently being used on both gasoline and diesel engines. This is pretty useful, especially for diesel engines since they produce way more nitrogen oxide than gasoline engines.

The EGR valve is able to reduce the nitrogen oxide emissions by up to 30% by simply recirculating some of the exhaust gases back into the combustion chamber to be burned again. However, the downside is that the EGR valve is only activated at certain speeds. This is mainly because the recirculated exhaust gases are hot and the engine requires fresh cold air for best performance. This is why the EGR valve only activates when your engine is between 1000 RPMs and 1500 RPMs.

The EGR has a valve that opens and closes depending on how much throttle you apply. When the vehicle is driving on low RPMs, the EGR valve is completely open and allows more exhaust gases to be recirculated back into the combustion chamber. However, if you apply full throttle, the EGR valve is completely closed and no exhaust gases are recirculated back into the combustion chamber.

Bigger engines usually have one EGR valve on each side. Also, in high-performance engines where temperatures are constantly high, the EGR system also has a cooler. A faulty EGR valve causes all sorts of problems including a check engine light, reduced engine power, and black smoke from the exhaust pipe.

How To Replace The EGR Valve On Ford Mustang (2000-2015)

How To Replace The EGR Valve On Ford Mustang (2000-2015)

Replacing an EGR valve on the 2000 to 2015 Ford Mustang requires basic skills. However, without the proper guidance, it can all turn into a mess. So, follow these steps and at the end of the article, you will know how to replace the EGR valve on Ford Mustang (2000 – 2015).

1. Required tools for the job

  • Scanning tool (OBD2)
  • New EGR valve
  • 10-millimeter socket
  • Safety goggles and gloves

2. Diagnose a bad EGR valve

Before removing any part of the vehicle that you suspect has gone bad, it is best to actually diagnose it. To diagnose a bad EGR valve, you will need a scanning tool. There are a lot of scanning tools and some of them are pretty expensive. However, I have been using this scanning tool that I got from amazon.com for $55 and it does wonders.

In order to diagnose a faulty EGR valve, you will need to hook up the scanning tool to the vehicle’s computer. To do so, you will need to get under the steering wheel. There you will see an OBD 2 port. Connect the OBD 2 scanner and start it. Select scan vehicle and wait for a couple of minutes.

Error codes associated with a faulty EGR valve are:

  • P0400 Exhaust Gas Recirculation Flow Malfunction
  • P0401 Exhaust Gas Recirculation Flow Insufficient Detected
  • P0402 Exhaust Gas Recirculation Flow Excessive Detected
  • P0403 Exhaust Gas Recirculation Circuit Malfunction
  • P0404 Exhaust Gas Recirculation Circuit Range/Performance
  • P0405 Exhaust Gas Recirculation Sensor A Circuit Low
  • P0406 Exhaust Gas Recirculation Sensor A Circuit High
  • P0407 Exhaust Gas Recirculation Sensor B Circuit Low
  • P0408 Exhaust Gas Recirculation Sensor B Circuit High
  • P0409 Exhaust Gas Recirculation Sensor A Circuit
  • P0486 Exhaust Gas Recirculation Sensor B Circuit
  • P0487 Exhaust Gas Recirculation Throttle Position Control Circuit
  • P0488 Exhaust Gas Recirculation Throttle Position Control Range/Performance
  • P0489 Exhaust Gas Recirculation Control Circuit Low
  • P0490 Exhaust Gas Recirculation Control Circuit Low

If you get any of the above codes, especially P0400, P0401, and P0402, it means that the EGR valve is faulty and needs replacing.

3. Locate the EGR valve

On the 2000 to 2015 Ford Mustang vehicles, the EGR valve is located on the front center of the engine, right next to the oil cap. The EGR valve has a round shape and it has either a vacuum hose or an electrical cord on top of it. The older Ford Mustangs have a vacuum line, whereas the newer models have electrical connectors on the EGR valve.

If you are not sure where the EGR valve is located on your Ford Mustang, you can always check the owner’s manual. It will tell you the exact location of the EGR valve.

4. Disconnect and remove the faulty EGR valve

Like I said before, the EGR valve can either be run by a vacuum line or an electrical power. In order to remove the faulty EGR valve, you will need to disconnect the line that powers it. So, remove the vacuum line or the electrical connector and get it out of the way. Just make sure it doesn’t get in contact with some oil or water.

Then, grab a 10-millimeter socket and remove the bolts on the EGR valve. There are usually two to three bolts that hold the EGR valve in place. Remove them carefully and store the bolts for later. If you are using a socket with an extension, you might need to remove the oil cap to gain more access.

5. Install the new EGR valve

The new EGR valve for your Ford Mustang might come with new screws. If that is the case, then use the new screws. However, if not, you can always use the old screws (if they are not broken or damaged). So, first, insert the screws and then attach the EGR valve onto the engine. Tighten the new EGR valve using a 10-millimeter socket. Then, reconnect the electrical cord/vacuum lines. Make sure they are connected properly.

6. Start your vehicle and scan it with a scanning tool

After you successfully have installed the new EGR valve, there shouldn’t be any issues with your vehicle anymore. However, the error codes can still be found. Depending on which tool you have, you can scan your vehicle and delete the error codes. Then, drive the vehicle for about 100 miles and see if the code comes back.

How Much Does It Cost To Get EGR Valve Cleaned

Getting your EGR valve cleaned, can cost you around $10 (to buy a carb cleaner) if you do it or around $100 if you take your vehicle to the repair shop. I would suggest you try to clean your EGR valve first as it might solve the issue. Here is how to clean your EGR valve without removing it. If this doesn’t solve the problem, then you can take your vehicle to the mechanic shop.

What Does a Blown 50 Amp Fuse Look Like (With Pictures)


Car fuses do not have a guaranteed lifespan. This means that they can get melted at any time. Almost all car owners experience a blown 50 amp fuse if they drive the same car for a long period of time. This happens when the main component malfunctions and requests a current higher than it can withstand. So, in order for the main component not to get burnt, the 50 amp fuse acts as a shield and gets blown instead. But what does a blown 50 amp fuse look like?

In this blog post, I am going to talk about what 50 amp fuses are used in cars, what does a blown 50 amp fuse look like, and how to replace a blown 50 amp fuse.

What Is 50 Amp Fuse Used For In Cars

A 50 amp fuse is used in cars for feeding several circuits including an engine idling with no lights on which typically draws 50 amps, or it can be used as the main fuse which feeds more than one circuit and is usually labeled as B+(battery positive). Basically, any component of the vehicle that requires 50 amps to run properly will be fed from a 50 amp fuse.

Fuses have been used for many years, starting all the way back from 1967. Modern vehicles have well over 50 fuses that are used to protect cables, wires, and electrical components. The way a fuse protects electrical components in a vehicle is it acts as a shield. When an electrical component starts to malfunction, it can draw more power from the car battery than it can handle. This is where fuses come into play.

For example, if an electrical component that is protected by a 50 amp fuse draws more than that voltage, the current will go from the battery and into the fuse. If the current is higher, it will cause the 50 amp fuse to melt and act as an open circuit. This means that the high current will stop at the 50 amp fuse and will not continue to the main component and burn it.

There are several 50 amp fuses in vehicles. Typically, when a car idles with no accessories on, it draws 50 amps of power. Also, on some vehicles, the 50 amp fuse can be labeled as B+ which means that it will act as the main fuse that feeds more than one electrical circuit.

A single 50 amp fuse can be responsible for feeding electrical power to more than one component.

What Does a Blown 50 Amp Fuse Look Like

What Does a Blown 50 Amp Fuse Look Like

A 50 amp fuse has a fuse wire that runs from one copper conductor to another copper conductor. The fuse wire acts as a bridge between the copper conductors and allows for proper current to flow through the 50 amp fuse and into the main component. However, a blown 50 amp will have a melted fuse wire from a sudden overload of electrical current and will look very differently from a brand new fuse.

You can tell that a 50 amp fuse is blown if you visually inspect it. The fuse wire that is supposed to allow current to flow through it will appear like melted/broken.

When the 50 amp fuse is blown, no electrical current will pass through it. This means that the main component that the 50 amp fuse was used to feed it has requested a larger voltage than it can handle. So, when the current went from the battery and into the 50 amp fuse, it automatically blew the fuse wire. The 50 amp fuse was designed that way and it actually acts as a fail-safe switch and melts before the high current reaches the main component.

If you suspect that one of the 50 amp fuses is blown, you can visually inspect it. Since the 50 amp fuse has a cartridge casing, it can be a bit difficult to check it. So, you will need to remove the top lid of the 50 amp fuse and visually inspect it. A properly working 50 amp fuse will have a fuse wire (metal alloy strip) that runs from one copper conductor to another copper conductor. If the 50 amp fuse is blown, the fuse wire will be melted/broken. At this point, you will need to replace the blown 50 amp fuse.

How To Replace a Blown 50 Amp Fuse

Fuses are designed to melt in order to protect the main component from being burnt. This means that they are destined to fail often. But do not worry. Replacing a blown 50 amp fuse is not as hard as people think. I will guide you through the process. So, without any further delay, here is how to replace a blown 50 amp fuse.

1. Order a new 50 amp fuse

When replacing a blown 50 amp fuse, it is important that you have a brand new 50 amp fuse on hand. Please do not use any old fuses because it is simply not worth it. A new 50 amp cartridge-style fuse costs around $1.30 but can save you a lot of money in the long term.

So, you can either order a new 50 amp fuse on amazon.com or go to your local part store. Whatever you decide to do, just make sure that you get the exact same fuse as your old one. A 50 amp fuse can be both in blade-style or cartridge-style.

2. Open the hood and locate the fuse box

Locating the fuse box can be difficult if you are a young DIY mechanic. Pull the latch underneath your steering wheel to open the hood. Then, as you stand in front of the engine, concentrate on the right side of the engine bay. You will notice a box that most of the time will be labeled as a fuse and relay box. That is what we are looking for.

3. Open the fuse box and locate the blown 50 amp fuse

The fuse box is usually secured by either a tab or a bolt. So, press on the tab or remove the bolt and open the fuse box. Underneath the fuse box lid, you will see a diagram of what each fuse is used for. Locate the blown 50 amp fuse with the help of the diagram.

Usually, there are two or three cartridge-style 50 amp fuses and a couple of blade-style 50 amp fuses. Take your time locating the blown 50 amp fuse.

4. Remove the blown 50 amp fuse

Once you locate the blown 50 amp fuse, it is time to remove it. First, try to remove the fuse with your hands. However, if the fuse is stuck, you can use pliers. When removing a blown 50 amp fuse, make sure that you don’t wiggle it around because you can damage the ports. It is important that you just pull it upwards in a straight line.

A note of caution. Some fuses just blew and do not do any damage to the container. However, a 50 amp fuse can sometimes melt, depending on how much current went through it. So, if the 50 amp fuse is melted, disconnect the battery and proceed with caution. Use gloves and pliers to remove the melted parts.

5. Visually inspect the blown 50 amp fuse

What does a blown 50 amp fuse look like

Just to be sure if you pulled out the correct blown 50 amp fuse, you will need to visually inspect it and then test it with a multimeter. Because the 50 amp fuse is in a cartridge, you will need to remove the lid. To do so, you will need to press the clips on each side with a toothpick or a needle and pull the lid off.

Once the lid is removed, you can visually inspect the 50 amp fuse. If the 50 amp fuse is blown, you will notice it right away. There is a metal alloy strip running from one side of the fuse to the other. It kind of looks like a bridge. If the ”bridge” is disconnected in the middle, it means that the 50 amp fuse is blown. However, sometimes is not this simple to diagnose a blown fuse because the fuse wire can break on a hard-to-see spot. This is why I always check it with a multimeter.

6. Test the blown 50 amp fuse with a multimeter

What does a blown 50 amp fuse look like

As I said before, some fuse wires can break in a hard-to-see place. This is why it is important to test the fuse with a multimeter. Get a multimeter and set it on ohms. Before you perform the test, touch both ends of the multimeter and remember the reading. Then, get the 50 amp fuse and insert the red and black wires from the multimeter into the fuse ports located on the backside.

If you get the same reading as you did when you only touched the wires from the multimeter, it means that the fuse is working correctly. However, if you get a different reading, it means that the fuse is blown. So, if you touch the wires and you get 1 ohm, and then you test the fuse and you get 0 ohms, it means that the fuse is blown.

7. Install the new 50 amp fuse

What does a blown 50 amp fuse look like

Before you install the new 50 amp fuse, make sure that the fuse port is clean. If there is any debris left there, it can cause the fuse to blow out immediately. Then, simply insert the new 50 amp fuse all the way down. Close the fuse box by pressing it until you hear a click. That’s it.

How Much Is a 50 Amp Fuse

A blade-style 50 amp fuse costs around $3 and a cartridge-style fuse costs around $1.30 on amazon.com. However, you can go to your local part store and probably get it for the same price, but without paying for shipping.

What Does a Blown 40 Amp Fuse Look Like (With Pictures)


Despite the size of the fuses in vehicles, they do play an important role. Like all parts in the vehicle, fuses to have an expiration date. They get blown when being exposed to a high current in order to prevent that current from traveling to the main component and damaging it.

Basically, fuses are in the first line of defense and they take the hit so the main component doesn’t get burnt. Each vehicle has a few 40 amp fuses that protect many important components. But, what does a blown 40 amp fuse look like? How can you tell when you need to change your 40 amp fuse?

In this article, I am going to talk about what is the 40 amp fuse used for, what does a blown 40 amp fuse look like, and how to replace a blown 40 amp fuse.

What Is The 40 Amp Fuse Used For In Cars

What Does a Blown 40 Amp Fuse Look Like

The 40 amp fuse is used in vehicles to protect components from overcurrent and short-circuiting that require 40 amps to operate. This includes the ABS system, ignition, ECU, window regulator mechanisms, and AC fans. When some of the components draw a stronger current than it is designed to handle, the 40 amp fuse gets blown in order to stop the current from traveling to the main component and burning it.

Basically, the larger the amperage, the more important and expensive the component is. So, instead of expensive components getting burned by drawing higher current each time they malfunction, vehicle manufacturers came up with a $2 40 amp fuse that will get blown instead of the main component.

Today’s vehicles can contain up to 100 ECUs, maybe more. Each of the electronic control units has been designed for a specific job including ABS, power steering control, the way to power windows, seat heaters, and AC. There isn’t room in the fuse box for each ECU, so many of them are protected by the same 40 amp fuse.

So, when some of these ECUs malfunction, they tend to draw more current from the battery than they are designed to withstand. When this happens, the current travels from the car battery, into the 40 amp fuse. The 40 amp fuse detects that the current is too strong and instantly gets blown. This action stops the high current from reaching the next stop which is the main component. By doing so, the 40 amp fuse protects the main components from getting burnt.

What Does a Blown 40 Amp Fuse Look Like

What Does a Blown 40 Amp Fuse Look Like

When a 40 amp fuse gets blown, the metal alloy strip or thin wire inside will look like it is broken. The 40 amp fuse has copper contacts on both sides and a metal alloy strip or thin wire running from one copper contact to the other. When the 40 amp fuse gets blown from a high current, the fuse wire in the middle of the cartridge melts and prevents further electricity flow.

You can tell that a 40 amp fuse is blown by visually inspecting it. Remove the plastic top cover and check for damages in the fuse wire. If the 40 amp fuse is blown, the fuse wire will look like a broken bridge between the two copper contacts.

A 40 amp fuse is designed to withstand 40 amps of electricity. If for some reason a higher current is being drawn from the main component, the 40 amp fuse will get blown and prevent the main component from being damaged. A properly working 40 amp fuse has a metal alloy strip that acts like a bridge between two copper contact.

When current comes from the car battery, it enters one copper contact and then flows through the metal alloy strip, into the other copper contact, and to the main component. However, when a higher than normal current is being drawn from the car battery, the high current will enter one copper contact, but the metal alloy strip will get melted. No current will flow into the other copper contact and into the main component. By doing this, the 40 amp fuse prevents further damage to the main component.

How To Replace a Blown 40 Amp Fuse

Replacing a blown 40 amp fuse can save you a lot of money. For example, a new 40 amp fuse costs around $2, but you can get charged up to $100 in a repair shop. So, instead of wasting money, here is how to replace a blown 40 amp fuse:

1. Order a new 40 amp fuse

Before you start the replacement task, you will need to get a new 40 amp fuse. The 40 amp fuses are so cheap that I just order a bulk of 10 online. Here is a 10-pack of 40 amp fuses on amazon.com. Just make sure that you get the exact same as your blown fuse. There are blade-style and cartridge-style 40 amp fuses. Also, do not try to install a fuse with different amperage as it will get blown immediately.

2. Open the hood and locate the fuse box

What Does a Blown 40 Amp Fuse Look Like

Some vehicles can have fuse boxes in multiple locations. The most common locations for fuse boxes are underneath the steering wheel and under the hood. However, the 40 amp fuses are usually located under the hood. You can always check the owner’s manual to learn more about your vehicle’s fuses.

Pull the latch and open the hood. The fuse box is usually located on the right side of the engine, next to the battery. On many vehicles, the fuse box will be labeled.

3. Open the fuse box and locate the faulty 40 amp fuse

To open the fuse box, you will need to pull the clip or tab and slowly remove the lid. There is a diagram on the fuse box lid that will help you easily locate the 40 amp fuse. As you can see, there can be multiple 40 amp fuses, so if you are not sure which one is blown, you can replace them all.

4. Remove the blown 40 amp fuse

There are a couple of ways to remove a blown 40 amp fuse. The method will depend on how bad the fuse is blown. In some cases, you might find a completely melted fuse. In that scenario, I would disconnect the battery before moving forward.

If only the fuse wire is blown, you can remove that fuse with your hands. If it’s stuck, you can go ahead and use pliers. However, be careful not to break the fuse in two and end up with half fuse stuck into the port. As far as a completely melted fuse, I would use gloves and pliers. Make sure to remove all of the pieces before installing a new fuse.

5. Visually inspect the blown 40 amp fuse

A blown 40 amp fuse can be a little bit tricky to visually inspect because it sits in a cartridge. So, to gain access and a better look, open the lid of the cartridge. To do this, you will need a toothpick. Push the tabs on each side of the cartridge and slowly pull the lid.

At this point, you can actually see if the 40 amp fuse is indeed blown. The metal alloy strip that runs from one copper contact to another has to be intact. If that ”bridge” looks like it’s disconnected, the fuse is blown. However, it’s not always this easy to visually inspect a blown fuse. Sometimes, the metal alloy strip tends to break in a hard-to-see place. So, that is why you should also check it with a multimeter.

6. Test the blown 40 amp fuse with a multimeter

The 40 amp fuse is used in vehicles to protect components from overcurrent and short-circuiting that require 40 amps to operate. This includes the ABS system, ignition, ECU, window regulator mechanisms, and AC fans. When some of the components draw a stronger current than it is designed to handle, the 40 amp fuse gets blown in order to stop the current from traveling to the main component and burning it.

Turn on your multimeter and set it on Ohms. Before you go ahead and test the blown 40 amp fuse, make sure to calibrate the multimeter first. Touch the red and black wires of the multimeter. If you get the same reading (1 in my case) when you touch the two wires and after that when you test the fuse, it will mean that the fuse is working properly.

However, if you get a reading of 1 ohm when you touch the wires, but then get a completely different reading when you test the 40 amp fuse, it means that the fuse is blown. I always like to test the fuses with a multimeter because sometimes they are not blown as I think, or they are blown but in a hard-to-see spot.

To actually test the 40 amp fuse with a multimeter, you need to insert the wires on the backside of the fuse, into the copper contacts, one wire per copper contact.

7. Install the new 40 amp fuse and close the fuse box

The 40 amp fuse is used in vehicles to protect components from overcurrent and short-circuiting that require 40 amps to operate. This includes the ABS system, ignition, ECU, window regulator mechanisms, and AC fans. When some of the components draw a stronger current than it is designed to handle, the 40 amp fuse gets blown in order to stop the current from traveling to the main component and burning it.

Install the brand new 40 amp fuse into the same slot that you pulled out the blown one. Make sure that there is no dirt and debris in the fuse port. Then, go ahead and close the fuse box and press it down until you hear the tabs click.

How Much Is A 40 Amp Fuse

A 40 amp blade-style fuse costs $1 and a cartridge-style 40 amp fuse costs around $1.5 per fuse. These prices are from Amazon. However, you can also check your local auto part stores or even a gas station. Buying fuses in bulk is even cheaper.

What Does A Blown 30 Amp Fuse Look Like (With Pictures)


Fuses were designed to act as an electrical safety device meant to blow up when in contact with a current that is higher than the fuse is designed to withstand. Many car owners deal with blown fuses. Some of them even drive with a blown fuse without knowing it. So, what does a blown 30 amp fuse look like? How can you tell that your 30 amp fuse is blown and needs replacing?

In this blog post, I will be talking about what a 30 amp fuse is used for, what a blown 30 amp fuse looks like, and how to replace a 30 amp fuse by yourself.

What Is 30 Amp Fuse Used For In Cars

The 30 amp fuse is used in vehicles for components that require 30 amps of electricity to run such as the AC, or the ignition. In order to protect the circuit, the fuse acts as the weakest point in the circuit. So, when the current is too strong, the fused element inside(metal strip or wire) of the 30 amp fuse heats up and breaks. The breaking action disconnects the circuit which means electricity can’t flow through it anymore and can not damage the main component.

30 amp fuses are usually used in vehicles for electric cooling fans, heater AC blower motor, or a 500 watt sound system. However, the amperage will of course depend on the size, and the speed setting of the fans as well as the load of the sound system.

There are different types of fuses in vehicles. Some fuses are blade style while some of them are in cartridges. The fuses are also made in different colors and materials which indicates the amperage of the fuse. A 30 amp fuse is made in pink color with a blue cover on top marked with number 30 for 30 amps.

Different components in your vehicle will require different amperage. For instance, components that don’t require a lot of electrical current like lights will have a 10 amp fuse. However, components that do require more electrical current such as the AC or ignition and possibly many other, will require a 30 amp fuse.

What Does a Blown 30 Amp Fuse Look Like

What does a blown 30 amp fuse look like

A 30 amp fuse has a metal strip or wire made out of silver, copper, alloy, aluminum, or zinc that is running through one side of the fuse to the other. This is where the current is running through the fuse. You can tell if a 30 amp fuse is blown by looking at it and seeing a discontinuous metal strip or wire which occurs from over current. Meaning, that if the current running through the 30 amp fuse is higher, the fuse will be blown and you need to replace it.

A blown 30 amp fuse will look like having a metal strip or wire that is disconnected in the middle of the fuse itself by being blown from over current.

There are a lot of types of fuses. Some are in cartridges, like the 30 amp fuse, and some are regular-looking fuses with two pins sticking out. What all fuses have in common is the metal strip or wire running from one side of the fuse to the other. Because the 30 amp fuse is usually in a cartridge, it is best if you open the cover and visually inspect it.

When comparing a new 30 amp fuse with a blown one, it is very clear to see the difference. The new 30 amp fuse has a metal strip or wire running through the middle of the fuse. However, a blown 30 amp fuse will not have a metal strip or wire running all the way through the middle of the fuse. The metal strip or wire is going to be discontinued probably because a high current has run through it and burnt it.

However, that is exactly why fuses were built in the first place. Instead of burning the main components whenever a high current passes through, the fuse is acting as the weakest point which gets blown and discontinues the high current before it goes into the main components.

How To Replace a Blown 30 Amp Fuse

What Does a Blown 30 Amp Fuse Look Like

Replacing a 30 amp fuse on your vehicle is very easy. However, there are some guidelines that you need to follow in order to make the replacement successful. Here is how to replace a 30 amp fuse in your vehicle:

1. Get a new 30 amp fuse

There are a lot of different fuses in the fuse box of your vehicle. Each fuse is labeled on top with a number of amps it can handle. It is very important to replace the fuse with the same amperage rating. If the amperage rating is too low, it will break too soon. More importantly, if the amperage rating on the fuse is too high, components may fail before the fuse does.

So, before you get started, order a 30 amp fuse on amazon.com. Please note that on some vehicles, the 30 amp fuse is with a cartridge and on some is the standard fuse with two blades. Just order the exact same as your vehicle uses.

2. Open the hood

What Does a Blown 30 Amp Fuse Look Like

On some vehicles, there are two fuse boxes. As shown in the photo above, right above the handle for the hood there is a fuse box. However, the 30 amp fuse is usually located under the hood. So, to gain access to the fuse box, you will need to open the hood by pulling the hood latch.

3. Locate and open the fuse box

What Does a Blown 30 Amp Fuse Look Like

In most vehicles, the fuse box is located under the hood, on the driver’s side. The box is labeled with a fuse and relay box written on top. The fuse box is usually secured with a clip, however, some fuse boxes may be secured with bolts. So, press the clip or remove the bolts to expose the fuses. Make sure that your vehicle is parked inside and away from any potential rain.

4. Locate and remove the faulty 30 amp fuse

What Does a Blown 30 Amp Fuse Look Like

Carefully observe the fuse box and locate the faulty 30 amp fuse. There is also a diagram on the cover of the fuse box that can help you in your search. Once you’ve located the 30 amp fuse, you need to remove it. The removal of the fuse can be done by hand as shown in the photo above or you can pull it out with pliers. However, some fuses have bolts on them. When you get your new fuse, inspect it to see if it has bolts on it. The fuses with bolts on need to be pushed down so you can expose the bolts and then remove them.

This is also a good time to visually inspect the fuse. A blown 30 amp fuse will look very differently from a new fuse because the metal strip that runs through the fuse itself will be disconnected/melted.

5. Test the faulty 30 amp fuse with a multimeter

On the backside of the 30 amp fuse, you will see two openings. Grab your multimeter and set it on ohms. Before you test the fuse, touch both of the wires of the multimeter in order to get a reading. The reading that you get now can be 0, 0.1, or even 1. Remember this number because you will need to get the same number when you test the 30 amp fuse. If you get a different number in the multimeter test from the number when you test the actual fuse, it means that the fuse is blown.

So, when I tested my multimeter I got a 0 ohms. Then, when I placed the wires on the backside of the 30 amp fuse, I got 1 ohm. This is a clear indication that the fuse is blown. Usually, you can visually inspect the fuse and see if it’s blown or not. However, sometimes, the fused wire can blow in a hard-to-see spot. This is why it’s best to test the fuse with a multimeter.

6. Install the new 30 amp fuse

Before you install the new 30 amp fuse, it is always a good idea to clean the fuse ports. Grab a dry clean towel and wipe the port. Who knows, it could be some dirt that got into there and blew the fuse in the first place. Also, if the blown fuse has melted, make sure to clean any residue before installing the new 30 amp fuse.

Close the fuse box by reinstalling the cover and you are good to go.

How Much is a 30 Amp Fuse

A 30 amp blade-style fuse costs around $1 per fuse, whereas a cartridge-style 30 amp fuse costs around $1.50. However, fuses for vehicles are usually sold in packages of 10 or more and the price is even lower. You will probably end up paying more for shipping than for the actual fuses. So, it is best to go and buy 30 amp fuses in your local shop or gas station.