Car Makes Fan Noise When Engine Off

Introduction

It is not uncommon for cars to make some noise after the engine has been turned off. This is usually caused by the cooling fan, which continues to run for a short period of time to help cool down the engine.

However, if the fan noise is particularly loud or persists for an extended period of time, it could be a sign of a problem. In this article, we will discuss the possible causes of car fan noise when the engine is off and what you can do to fix the problem.

Possible Causes of Car Fan Noise When Engine Off

Cooling fan relay stuck on: The cooling fan relay is a small electrical switch that turns the fan on and off. If the relay becomes stuck in the on position, the fan will continue to run even after the engine has been turned off.
Cooling fan motor故障: The cooling fan motor is an electric motor that powers the fan blades. If the motor fails, the fan will not be able to run and the engine will overheat.
Loose fan belt: The fan belt is a rubber belt that connects the engine to the cooling fan. If the belt is loose, it may slip and cause the fan to make a noise.
Damaged fan blades: The fan blades are made of thin metal and can be easily damaged. If the blades are bent or broken, they may make a noise when the fan is running.
Foreign object in fan: If a foreign object, such as a leaf or a piece of paper, gets into the fan, it can cause the fan to make a noise.

How to Fix Car Fan Noise When Engine Off

If you are experiencing car fan noise when the engine is off, there are a few things you can do to try and fix the problem:

Check the cooling fan relay: The cooling fan relay is usually located in the fuse box. To check the relay, simply remove it from the fuse box and inspect it for any signs of damage. If the relay is damaged, it will need to be replaced.
Check the cooling fan motor: To check the cooling fan motor, you will need to use a multimeter to measure the voltage at the motor terminals. If the voltage is not present, the motor has failed and will need to be replaced.
Check the fan belt: To check the fan belt, simply look at it for any signs of wear or damage. If the belt is loose, it will need to be tightened or replaced.
Inspect the fan blades: To inspect the fan blades, simply look at them for any signs of damage. If the blades are bent or broken, they will need to be replaced.
Remove any foreign objects from the fan: If you see any foreign objects in the fan, simply remove them. Be careful not to damage the fan blades when removing the objects.

Conclusion

If you are unable to fix the car fan noise when the engine is off yourself, you should take your car to a mechanic for further diagnosis and repair.