Automotive radiator is a heat exchanger used to transfer thermal energy from one medium to another for the purpose of cooling and heating. The majority of automotive radiator is constructed to function in automobiles, buildings, and electronics. The automotive radiator is always a source of heat to its environment, although this may be for either the purpose of heating this environment, or for cooling the fluid or coolant supplied to it, as for engine cooling.

Automotive radiator is used for cooling internal combustion engines, chiefly in automobiles but also in piston engine aircraft, railway locomotives, motorcycles, stationary generating plants or any similar use of such an engine.

They operate by passing a liquid coolant through the engine block, where it is heated, then through the automotive radiator itself where it loses this heat to the atmosphere. This coolant is usually water-based, but may also be oil. It is usual for the coolant flow to be pumped, also for a fan to blow air through the automotive radiator.

Automotive radiator work better when the cooling system is under pressure. The behr automotive radiator is a major component of the cooling system, and is in charge of eliminating excess heat away from the engine. A highly-efficient automotive radiator is a very big factor affecting not just the vehicles performance but also its ability to combat overheating which an automotive radiator specializes in.