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A radiator cap is an essential component in an automotive engine's cooling system. Its primary function is to regulate the pressure within the radiator and prevent coolant from boiling over. The cap features a spring-loaded valve that opens when the pressure inside the radiator exceeds its limit, allowing excess fluid to escape through an overflow tube. When the pressure decreases, the valve closes, sealing the system and maintaining the required pressure. Additionally, the radiator cap helps in keeping the coolant from evaporating and ensures proper circulation of the coolant within the engine. Overall, a radiator cap plays a crucial role in maintaining the optimal temperature of an automotive engine and ensuring its longevity.