"Mini Air Cooling Fan" automotive engine cooling system with air cooling and liquid cooling two forms. The most commonly used is liquid cooling. That is used to cool the liquid circulating through the system, and then to cool the engine, the radiator cooling fan is used to complement the wind velocity is forced to meet the cooling needs of the engine through the radiator moderate heat. Various fan control types, control their own characteristics. Big car manufacturers what they need under different circumstances, and thus present a variety of types of control technologies coexist.