Quote:
Originally Posted by H-Man
You have a bad thermostat chances are if the temperature fluctuation of the coolant is that noticeable, replacing the thermostat would yield a bigger gain in MPG.
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Sorry, my point was radiator temp fluctuations not engine coolant temps, I run a seperate temp gauge on radiator outlet, that is the one that fluctuates, the engine coolant temp is fine, very steady, so thermostat is working perfectly fine.