A radiator is a part of your automobile's cooling system, most radiators you can find located in front of the engine's motor and right behind the vehicle's grille. The radiator is connected to the vehicle's engine with rubber hoses. The purpose of the readiator is to cool the engine's coolant. The coolant is heated by the engine but is cooled down as it cirulates through the radiator. It is cooled from the air that passes through the fins of the radiator.