The reasons for the abnormal sound of the car air conditioner fan are:
1. The filter element has not been replaced. It may be because the air conditioner filter element has not been replaced for a long time, and a lot of impurities are absorbed in it, which causes abnormal noise from the fan when the vehicle is running, and the air conditioner filter element needs to be cleaned or replaced in time.
2. The pipeline is blocked. Poor heat dissipation of the air conditioner or clogged pipes will cause abnormal noise of the compressor. If the internal pressure of the compressor is too high, the service life will be reduced, and the pipeline needs to be dredged in time.
3. Tensioner failure. It may be that the bearing of the belt tensioning wheel of the generator or air conditioner is faulty, or the tensioning wheel loses the function of automatically adjusting the belt, resulting in abnormal noise, and the tensioning wheel needs to be repaired.
4. The clutch bearing is worn out. It may be that the clutch bearing in the air conditioner pump is worn out, causing abnormal noise after the air conditioner is turned on, and the air conditioner pump assembly needs to be replaced.
5. The fan blade hits a foreign object. Check whether the fan blades of the car fan encounter foreign objects during operation. If there are foreign objects, they need to be cleaned in time.
6. Replace the fan. If the abnormal noise is caused by the failure of the fan itself, it needs to be repaired in time. If it cannot be repaired, a new fan needs to be replaced.
7. Replace the motor. It may be because the motor of the fan is faulty. It is recommended to go to a car repair shop or 4S shop for inspection. If the motor is damaged, it needs to be replaced in time.
8. Lack of lubrication. It may be caused by the lack of lubrication of the bearing of the fan, which can be solved by adding a small amount of grease or replacing the bearing.
9. Fix the screws. It may be because the fixing screws of the fan are loose. You need to use a screwdriver to fix the loose screws.
10. The temperature is overheated. It may be due to long-distance driving that the temperature detected by the engine water temperature sensor is too high, and the fan will rotate at high frequency, resulting in abnormal noise. It is necessary to stop and rest until the engine temperature drops.