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Re: Do thermostats have a break in period?
10-15 degrees in fluctuation for the temperature is fairly normal, and will not hurt anything. Remember, all the thermostat knows to do is open at a certain temperature, and close at a certain temperature.
Generally, when a thermostat is bad they stick open and the truck will not warm up to operating temperatures.
And when there is air trapped under the thermostat the motor will overheat, since air does not heat up like the coolant and water does to open the thermostat
Beyond that I would just run it and move on.
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