Why does the car fan keep running after the engine is turned off?
1 Answers
Reasons why the radiator fan continues to run after the car engine is turned off: Engine protection: If the engine coolant temperature at the moment of parking is higher than the acceptable soak temperature for the engine, the vehicle's computer will automatically calculate the fan's operating speed and duration, thereby controlling the fan's operation. The higher the engine temperature, the longer the fan will run after parking; when the engine coolant temperature drops below the soak temperature, the fan will turn off. This protects the engine and extends its service life. To prevent car self-ignition: In ordinary cars, the cooling system also stops working after the engine is turned off, often causing the engine temperature to rise further after shutdown, leading to damage. Therefore, modern high-end cars are equipped with an automatic cooling function. The radiator's power is directly connected to the battery, so even after the engine is turned off, if the temperature remains high, the cooling fan will continue to operate for a period until the temperature cools down sufficiently, preventing high temperatures from causing the car to self-ignite.