As engine coolant cycles through your engine, it heats up as it dissipates and absorbs the heat from the engine to help cool it down. After travelling out of the engine, it enters your radiator to cool back down and lose head to the atmosphere, being pushed through a series of pipes which are kept cool by the air flowing into the front of the car. This is why the radiator is normally the first thing located behind your car’s front bumper. Radiators are often helped in their job with the use of water pumps to force coolant through, as well as fans to assist with air flow.