Why does the Volkswagen car's fan keep running after the engine is turned off?

[OLiam]

After the vehicle is turned off, the fan continues to run because the engine temperature is too high. The vehicle's computer automatically calculates the fan's speed and duration. The higher the engine temperature, the longer the fan runs to protect the engine. The higher the engine temperature, the longer the fan runs after parking; when the engine coolant temperature drops below the soaking temperature, the fan turns off. This protects the engine and extends its lifespan. The car radiator consists of three parts: the inlet chamber, the outlet chamber, and the radiator core. The coolant flows inside the radiator core, while air passes outside the radiator. The hot coolant cools down by dissipating heat to the air, and the cold air heats up by absorbing the heat from the coolant. Working principle of the car cooling fan: Utilizing the principle of electromagnetic induction, it uses Hall sensing components as synchronous detection devices to control a set of circuits, switching the energizing sequence of the windings to generate a rotating magnetic field, achieving a new type of electromechanical integrated fan with electronic commutation. 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 to carry away the heat from the coolant in the radiator, thereby achieving the purpose of cooling the engine.