The radiator fan is a vital part of a car’s engine cooling system. With the design of the auto engine cooling system, all heat absorbed from the engine is stored in the radiator, and the cooling fan blows the heat away,it blows cooler air through the radiator to lower the coolant temperature and cool off the heat from the car engine. The cooling fan is also known as a radiator fan because it’s mounted directly to the radiator in some engines. Typically, the fan is positioned between the radiator and the engine as it blows heat to the atmosphere.