The Automotive Cooling Systems are also know as car radiators. The radiators are heat exchangers used for cooling internal combustion engines.
The Internal combustion engines are often cooled by circulating a liquid called engine coolant through the engine block, where it is heated, then through a radiator where it loses heat to the atmosphere, and then returned to the engine.
Internal combustion engine cooling uses either air or a liquid to remove the waste heat from an internal combustion engine. For small or special purpose engines, air cooling makes for a lightweight and relatively simple system.
This video demonstrate how the cooling system of an internal combustion engine works.
Check it out!