pressure cap

pressure cap
A special cap for the radiator, it holds a predetermined amount of pressure on the water in the cooling system, this enables the water to run hotter without boiling. In this way, the engine can operate at a higher and a more efficient temperature without danger of overheating. The cap also has a vacuum valve that lets air into the cooling system if the pressure falls too low to prevent outside air pressure from causing a partial collapse of the radiator.
See

Dictionary of automotive terms. 2015.

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  • cap — I. /kæp / (say kap) noun 1. a covering for the head, especially one fitting closely and made of softer material than a hat, and having little or no brim, but often having a peak. 2. the flat, peaked headdress worn by soldiers and others. 3. a… …  

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