The radiator is Grand Central Station for an engine’s cooling system. The mixture of antifreeze and water that cools the engine continually passes through the radiator. It discharges some of the heat it picked up from the engine and takes in cooler air before circulating again through passages around the engine. A spur line sends warm coolant to the heater core to generate heated air for the interior when needed. Debris such as dirt, leaves and plastic bags can collect on radiators and reduce their cooling ability.
