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The job of a car's cooling system is to keep the motor or engine from overheating, by transferring the heat of an engine into air. The cooling system allows the engine to maintain a certain, more constant heat.
The engine needs to heat up quickly so not to cause wear on internal engine parts. A cold engine will emit more pollution and is less efficient than a warm engine. A radiator is one of a vehicle's main cooling systems and considered a heat exchanger. A radiator coolant or fluid will flow through the radiators many flat tubes. The wing from a fan and the forced wind coming from the road cools the fluid (or coolant). The fluid is also designed to withstand certain temperatures and that helps to keep the vehicle from overheating.