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Car radiators are heat exchangers used in vehicles to transfer heat from the hot coolant that flows through them to the surrounding air. They are typically made of aluminum or copper and consist of a series of tubes and fins that allow for efficient heat transfer. The radiator plays a crucial role in maintaining the engine's optimal operating temperature by dissipating excess heat generated during combustion. It is an essential component of the vehicle's cooling system, helping to prevent overheating and engine damage.