The purpose of the ____ is to help the engine ____ warm up ____ and try to maintain the same ____ throughout many different operating conditions, like a ____ day or a very cold day, so that the engine temperature remains the ____. As the temperature ____, the ____ expands and forces the valve ____ against the ____. This allows water to pass through to the ____. If the water cools, the spring will force the valve to ____. When filling the water system, the air is allowed to pass through the ____, stopping ____ from forming.

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