What is the reason why the car fan is still running after parking and turning off the engine?

1 Answers
VanPeter
07/30/25 7:55am
The reason why the car fan is still running after parking and turning off the engine is to cool down the engine. When the temperature of the coolant is too high after parking, the vehicle's computer will automatically calculate the fan's speed and duration. The higher the temperature, the longer the fan will run, which serves as protection for the engine. The working principle of the car cooling fan is: utilizing the principle of electromagnetic induction, using Hall sensing components as synchronous detection devices to control a set of circuits, switching the power-on sequence of the windings to generate a rotating magnetic field, thereby achieving electronic commutation in a mechatronic system. The cooling fan is installed between the engine and the radiator. When the fan blades rotate driven by the engine, they generate high-speed airflow, which carries away the heat from the coolant in the radiator, thus achieving the purpose of cooling the engine.
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