There are a lot of things that can go wrong with your car, and one of the most frustrating problems is when the blower motor keeps running even after you’ve turned the car off.
Several different issues can cause this, but thankfully there are some steps you can take to troubleshoot the problem and get your car back to normal.
The main cause that keeps the blower motor running when the car is turned off can be a shorted wire, a damaged blower motor resistor, or a faulty blower control module.
In this article, we will discuss what might be causing your blower motor to keep running, how you can go about fixing it, and how to prevent it from happening in the future.
What Is A Blower Motor?
A blower motor is a component in your car that is responsible for moving air through the ventilation system. When you turn on the heater or AC, the blower motor starts up and blows air through the vents.
Why Does My Blower Motor Not Shut Off?
There are a few reasons why your blower motor might keep running after you turn your car off. The most common causes are:
1. A Faulty Ignition Switch
This is the most common cause of a blower motor running after the car is turned off. If your ignition switch is faulty, it may not send the correct signal to the blower motor to turn off when you turn your car off. Fixing this is usually as simple as replacing the ignition switch.
2. A Faulty Blower Motor Resistor
When your blower motor resistor is faulty, it may not send the correct signal to the blower motor to turn off when you turn your car off. This can cause your blower motor to run continuously, even when your vehicle is turned off. You can fix this problem by replacing the blower motor resistor.
3. Blower Control Module That Is Bad
This is a computer that controls the blower motor speed. When it goes bad, it can cause the blower motor to stay on even when the car is turned off.
The good news is that this is usually an easy fix. You can often replace the blower control module yourself with a new one from the auto parts store.
Related content: Shift Lock Release Button Not Working (Solved)
4. Shorted Wire Causing The Fan To Remain On
This is the most common problem and is easily fixed. The wire going to the blower motor has probably frayed and broken, causing a short. The fix is to simply replace the wire or solder it back together.
5. Stuck Fan Relay
In case your blower motor keeps running when the car is turned off, it could be because the fan relay is stuck in the on position. You can try to reset the relay by disconnecting the battery for a few minutes. If that doesn’t work, you’ll need to replace the relay.
How Do You Know If The Blower Control Module Is Bad?
There are a few symptoms that may indicate the blower control module is failing. One is if the blower motor keeps running after the car is turned off. Another sign is if the blower motor only works at certain speeds or if it doesn’t work at all.
When experiencing either of these issues, it’s important to take your car to a mechanic as soon as possible. A bad blower control module can cause many problems, including draining your battery, overheating the engine, and even causing a fire.
Related content: Can You Manually Turn A Blend Door Actuator? (Answered)
How To Check For Shorted Wire?
To check for a shorted wire, use a voltmeter to test the continuity of the wire. If the voltmeter shows that there is no continuity, then the wire is most likely shorted.
When you find that the wire is shorted, you will need to replace it. You can purchase a replacement wire at your local auto parts store.
Once you have replaced the wire, you should test the blower motor to ensure it is working properly. In any case, if the blower motor does not work, you may need to replace it. You can purchase a replacement blower motor at your local auto parts store.
How Do You Know If A Fan Relay Is Stuck?
A stuck fan relay can cause your blower motor to run continuously, even when your car is turned off. This can lead to a dead battery, as well as other problems. Whenever you may have a stuck fan relay, there are a few things you can do to test it.
- First, you’ll want to check the fuse for the fan relay. If the fuse is blown, the relay is likely stuck.
- You can also try swapping the relay with another one from a different circuit. If the problem persists, it’s probably the relay.
How Much Does The Repair Cost?
The average cost of repairing a blower motor that keeps running when the car is turned off ranges from $200 to $600. However, the exact cost will depend on the make and model of your vehicle, as well as the severity of the problem. If you have a warranty, it may cover some or all of the costs.
Related content: Why Don’t You Connect The Negative When Jumping A Car?
Tips to Keep Your Blower Motor Working Properly
A blower motor that keeps running after your car is switched off can be frustrating. But there are some things you can do to prevent this problem from happening in the future.
- Make sure that your battery is in good condition and properly charged. A weak or dead battery can cause the blower motor to keep running even when the car is turned off.
- Check the wiring to the blower motor. Make sure all the connections are tight, and there is no corrosion. If the wiring is damaged, it can cause the blower motor to keep running even when the car is turned off.
- Check the fuse for the blower motor. If the fuse is blown, it can cause the blower motor to keep running even when the car is turned off.
- Check the relay for the blower motor. If the relay is bad, it can cause the blower motor to keep running even when the car is turned off.
Try one or more of these solutions for a blower motor that keeps running when the car is turned off. With a little bit of troubleshooting, you should be able to fix the problem and prevent it from happening again in the future.
Frequently Asked Questions
What would cause my blower motor to keep running when I turn my car off?
There are a few things that could cause your blower motor to keep running when you turn your car off. A bad fuse, a bad relay, or a shortage in the wiring could all cause this problem.
How much does fixing a blower motor that keeps running when the car is turned off cost?
The average cost of repairing a blower motor that keeps running when the car is turned off ranges from $200 to $600. However, the exact cost will depend on the make and model of your vehicle, as well as the severity of the problem.
How does the blower motor fail?
The most common cause of failure for the blower motor is a short in the wiring. This can be caused by several things, including corrosion, a loose connection, or damaged insulation.
Conclusion
When your blower motor keeps running when the car is turned off, it can be frustrating. The main reasons why this happens are; a faulty ignition switch, a faulty blower motor, or a short in the wiring.
The average cost of repairing a blower motor that keeps running when the car is turned off ranges from $200 to $600. With a little bit of work, you should be able to get your blower motor working properly again.
Brian is an auto technician who writes DIY repair articles and creates how-to videos for MechanicAsk. He focuses on common repairs like brakes, oil changes, and lighting. Brian draws on his 5 years of dealership experience to explain repairs in an easy-to-follow manner, even for novice do-it-yourselfers. His technical articles always include detailed tool lists, supply checklists, and visual guides.
