You may be able to tell from the gauge, if within a bull`s roar of accurate, if a thermostat is fitted. Slow to warm up, doesn`t reach full temp, temp rises with harder worked engine, drops at lower rpm, may mean none fitted. That`s how I discovered one was not fitted. It`s usually left out for a reason,engine gets hot with one fitted, indicating something is not right. Alternatively, it could be fitted but stuck open. You can test it, once removed put it in cold water which you heat on the stove, see if it is closed and then opens as the water gets hot.
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BruceK
2005 Integrity 386 "Sojourn"
Sydney Australia
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