What is the role of car cooling fans? The bai function of the automobile cooling system is to dissipate part of the heat absorbed by the heated parts in time to ensure that the engine is working at a proper temperature. Answer The cooling system of the engine is divided into air cooling and water cooling. The cooling system with air as the cooling medium is called air cooling system; the cooling system with cooling liquid as the cooling medium is called water cooling system. The cooling system of the automobile engine is a forced circulation water cooling system, that is, the pressure of the coolant is increased by a water pump, and the coolant is forced to circulate in the engine. The cooling system is mainly composed of water pumps, radiators, cooling fans, compensation water tanks, thermostats, water jackets in the engine block and cylinder head, and auxiliary devices. In the cooling system, there are actually two heat dissipation cycles: one is the main cycle for cooling the engine, and the other is the heating cycle in the car. Both cycles are centered on the engine and use the same coolant.