Internal combustion engines create an enormous amount of heat. That heat has to be transferred away from the engine to prevent overheating and damage to internal parts. Too much heat may be the enemy, but too little heat can cause problems as well. The radiator may be the most well known component in the cooling system, but is up to the water pump and thermostat to control the flow of antifreeze through the system. In some cases added cooling capacity can come in the form of an oil cooler or air intake intercooler. Each part has a special job, and the failure of a single one can cause serious problems. Your local NAPA Auto Parts location has the heating & cooling parts you need to keep your engine running at optimal temperature.