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Thermostats - What Do the Degrees Mean?


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That refers to the temperature that the thermostat is designed to function at. They start opening at around 10 degrees cooler than indicated, and are fully open a few degrees above. In theory when the water temperature reaches that rated temperature, then it is flowing through the radiator and cooling off, thus the thermostat opens or closes accordingly to keep the engine temperature close to constant.

 

-Mike

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