When Does the Fan Behind the Car Radiator Start Running?

1 Answers
VonJaxson
07/25/25 3:54am
Currently, whether the fan operates is primarily determined by the coolant temperature. If the temperature is not high, the fan does not run upon startup. More details are as follows: 1. After idling the car, if the radiator fan does not spin even when revving the engine in neutral, this is normal. However, if the fan still does not operate after driving when the coolant temperature rises and the car is stationary, this indicates an issue, typically a faulty thermostat. 2. One type of radiator fan is directly driven by a pulley, meaning it runs whenever the engine is operating. The drawback of this design is that the fan operates even under low-temperature conditions, which hinders the engine from quickly reaching its optimal working temperature. 3. The mainstream design nowadays employs an electromagnetic fan, which only engages and starts running when the engine reaches a certain temperature. Therefore, the fan generally does not operate immediately after starting the car.
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