What is the problem when the car cooling fan rotates slowly?

1 Answers
Cinna
07/30/25 7:29am
Reasons for the fan slowing down: Automatic speed control: Automatically reduces speed when the temperature is not high. Temperature sensor failure: The method to check is to see if it can effectively lower the CPU temperature. If the temperature sensor fails, it may show a lower temperature even when the actual temperature is high, preventing the fan from speeding up, though this probability is very low. Fan damage: Generally, do not add oil because the fan rotates at high speed and is mainly made of plastic. The oil usually used is not suitable, and improper selection may cause issues like dissolution and adhesion. Of course, if it is a high-end metal bearing, oil can be added.
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