Updated at: 13-03-2022 - By: micdot

The fan in your car may continue to run even after you have turned off the engine. Drivers are likely to find themselves in a predicament like this on a regular basis. Keep reading to find out what you should do in this case. If you don’t know what to do when the automobile fan isn’t switched off, this article is for you. Even after the engine has been shut off, this continues to occur. People are scratching their heads, unsure of what’s going on. You’ll understand why your automobile fan won’t shut off after reading this article. What to do if your automobile fan keeps running even after the engine has been shut off is something you’ll learn about as well. Let’s get right down to the business at hand, without further ado.

11 Reasons Car Fan Keeps Running When Car Is Off

As soon as the engine is turned off, the cooling fan will continue to run for a few minutes. In most cases, it would keep on for a few minutes before coming to an end. I don’t see anything wrong with that. Consequently, if your automobile fan continues to run for a few minutes after you come to a complete stop, you need not be concerned. That’s how things generally go. Car fans in Mercedes-Benz and BMW models can run for up to five minutes before coming to a complete halt. There are, however, instances in which the car fan refuses to shut off. You may be experiencing electrical problems, which might cause the car fan to stay on and drain your car’s battery.

If your car’s engine is operating, coolant will circulate from the engine and into your engine’s radiator. The heat will dissipate here. As a result, the coolant in your car’s engine will not circulate if the engine is switched off. Consequently, the engine will take a long time to cool down because the heat will be trapped. Coolant fans assist the engine cool down after the vehicle is turned off. If your car’s fan continues to run even after you’ve turned it off, there are a few additional possible explanations. Here are a few examples.

1. Heater Core

The heater core is the seventh possible cause of your vehicle’s malfunction. It’s a good idea to check your heater core for leaks first.

2. Coolant Temperature Sensor

You may also have a problem with your coolant level sensor. You may have a defective coolant temperature sensor if your automobile fan continues to run even when the engine is off. ECUs, or engine control units, are common in modern cars. The coolant temperature sensor provides information to the engine’s control unit, also known as the ECU.

3. Leakage In The Coolant

Your coolant is a fourth potential source of the issue. Leaks in your coolant can be caused by the water pump.

4. Thermostat Housing

Your thermostat housing could be the ninth problem. It’s possible that the thermostat casing has leaked on them..

5. Coolant Level

Your coolant level is one thing to check initially. The coolant in your automobile may be low if your fan continues to operate even after you shut off the engine.

Radiator fan For trucksfan, radiator, car, engine, cooling

6. Radiator

Your radiator could be the sixth potential issue. Your car fan may fail to shut off if your radiator is damaged or cracked.

7. Radiator Hoses

Radiator hoses, as the sixth possibility, could be the source of the issue. Your upper and lower radiator hoses can wear out over time. As a result, your vehicle’s fan may develop malfunctions such as failing to shut off.

8. Wirings

Your wiring could be the eleventh issue that has to be addressed. It’s possible that you’re lacking in electrical lines. There’s a chance your electrical wiring isn’t up to code.


Your PCM or ECU, as a last resort, could be the source of the issue. Either your PCM or your ECU could be faulty. Have them both look for a solution.

10.  Coolant Bypass Pipe

Your coolant bypass pipe is a ninth potential source of trouble. A corroded coolant bypass pipe can affect your vehicle’s performance. The pipe might be harmed by rust.

11.  Radiator Fan Relay

Your radiator fan relay is the tenth possible issue. The radiator fan relay should be checked. The fan relay is in charge of managing the flow of electricity to the cooling fan. The automobile fan will be affected if the relay has problems or flaws. Radiator fan relays, for example, may become stuck in the on position.

How To Fix That The Fan On Your Car Won’t Turn Off?

If your vehicle’s fan continues to run even after the engine has shut down, you need to know how to fix it. It is possible that the fan in your car will run for a period of time of thirty to thirty-five minutes. That’s why it’s a good idea to remove and disconnect the battery’s negative cable so that your battery doesn’t run out. The relay is the likely culprit after removing the negative side of the battery line and turning off the engine’s cooling fan. The coolant level can also be checked. To begin with, make sure you have enough coolant in your radiator.

Check for leaks as well. You may activate the automobile fan if you have a low coolant level, for example, because the engine will be hotter. Troubleshooting procedures can also be taken. A new fan relay can be installed in place of your old one. Use the same pin style. A digital multimeter can be used to test the cooling fan relay as well.

Car AC Fan Won’t Turn Off: What To Do?

You could potentially be encountering issues with your air conditioner’s fan. The AC fan may refuse to turn off for whatever reason. A stuck relay is the most common cause of an air conditioner that won’t shut off. The thermostat may need to be replaced or short-cabled if you’ve determined the problem isn’t with your relay. Call for an expert or a service professional right away. First, check your thermostat settings before they replace your components.

To keep the air conditioner from shutting off, you should set the intended temperature slightly higher than the room’s current temperature. You should then check the thermostat to make sure that the fan is not set to run even after several minutes of no use. Contacting a service expert is the next step in the process if you are satisfied that all your settings are right. You could be dealing with a faulty relay. Assists in opening and closing electrical circuits so that they can activate components like the fan of your air conditioner. For a period of time, the relay may malfunction or develop flaws. As a last resort, you may have a thermostat that is broken. Because it won’t know when the temperature is set correctly if your thermostat is broken, your air conditioner’s fan will run nonstop.

Car Engine Fan Won’t Turn Off: What To Do?

A network of circuits controls the engine cooling fan. The computer will know whether or not to switch on or turn off the cooling fan based on the reading from the coolant temperature sensor. The computer will automatically turn on the cooling fan if the temperature approaches or surpasses a certain threshold.

The average temperature is approximately 215 degrees Fahrenheit. As a result, you can remove the hood to find the fuse relay box. In most cars, this is located on the driver’s fender well. Remove the lid if you’ve found it. After that, search for the fuse and relay mapping on the lid’s inside. At long last, remove the cooling fan relay and install a new one.


A common misunderstanding arises when the cooling fan does not shut off after the engine has been stopped. After the engine has been shut off, the car’s fan may continue to run. There are a number of plausible explanations for this. You must investigate these prospective causes and discover the particular causes before you can come up with a remedy.