Radiator : Is a critical part used for cooling the engine of your automobile. A radiator operates by passing water with antifreeze through the radiator core tubes. Thin pieces of metal are used to radiate the heat from the tubes. Traditionally radiator cores where made of copper and brass material, but due to the cost of these materials oem (original equipment manufacturer) radiators are made of aluminum. Air is an important part of heat transfer, so fans are often paired with the radiator to cool the air.