Not Ranked
Monster,
I agree with Buzz, thermostats ensure that the engine temperature stays above the the temperature value. If you are running significantly above that temp you need to increase air flow over the radiator or increase the radiator size (or effectiveness with Water Wetter for example).
To keep the temp AT the thermostat value, you need a thermo switch on the fan, it needs to go in the bottom coolant line and be set to a temperature below the thermostat value. Otherwise, there is no "reserve" of cooler water to reduce the engine temp and the temp will wander up above the thermo switch temp.
In a nutshell, the themostat sets the minimum temp, the thermo switch on the fan sets the approximate upper limit IF the radiator and fan are adequate.
Jim
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