VARIATIONS


Thermostats differ according to the temperature at which they open and thus permit flow of coolant into the radiator. Temperature ratings indicate the temperature at which the thermostat begins to open; ratings are usually between 180° F. and 195° F. Modern engines usually have higher operating temperatures for more complete combustion and therefore utilize hotter thermostats. It is very important to always use a thermostat with the vehicle manufacturer's recommended temperature rating.

The thermostat temperature rating should not be confused with the engine operating temperature, which is about 20° F. higher. The engine operating temperature is the stabilized coolant temperature during normal operation.


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