What is the reason for the car fan not rotating at high speed?
2 Answers
The reason why the car fan does not rotate at high speed is due to a malfunction in the car's fan itself; or a failure in the car fan's temperature controller or relay. Below is a related introduction to the car's electric fan: Working principle: Generally divided into two-speed rotation, the car's air conditioning will also control the operation of the car's electric fan when it is turned on, and it will drive the car's electric fan to work when the engine needs to cool down. Function: It can minimize the energy consumption of the car engine. The car's electric fan is usually installed behind the car's radiator, and some car models install the fan in front of the radiator. The radiator temperature is cooled by the fan to ensure the use of the car engine.
There are several common reasons why my car's fan doesn't spin at high speed. The most common one is a blown fuse. Try finding a fuse of the same model in the engine compartment's fuse box and replacing it. Another possibility is a faulty temperature sensor; if the sensor doesn't detect high temperatures, the fan won't accelerate. It could also be a bad relay or motor—aged relay contacts may not connect, or a worn motor may fail to reach higher speeds. Circuit issues like short circuits or open circuits can also affect signal transmission. When the fan doesn't spin at high speed, the hood may smoke and the water temperature may soar during traffic jams or uphill driving. I experienced this last time and almost burned out the engine. Quickly check if the fan bearings are stuck and clean any dust accumulated on the cooling fins. Pay more attention to the fan system during maintenance—don't wait until a breakdown to rush repairs. It's advisable to buy an OBD scanner to read fault codes for easier diagnosis.
