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A car doesn't need radiation, it needs a radiator. The heat is released from the radiator, which is part of it's water cooling system. All internal combustion engines require some type of cooling system to control the operating temperature of the engine. Basically there are two types of cooling systems for gas engines: air cooled and water cooled. An air cooled system for a car would be ineffective because the engine is enclosed thus it wouldn't receive enough air-flow to control the engine's operating temperature. this same principal is why an air cooled engine can be used on a motorcycle. A water cooled system works by having a radiator connected to the engine which has a pulley driven water pump that constantly circulates the water/coolant mixture from the radiator to the engine. The design of the radiator is made of metals that dissipate heat quickly which cools the water which in turn helps to cool the engine.

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Q: Why does a car need a radiation?
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