Chances are u have something else going on like an air block in the cooling system, if u changed coolant and didn't follow the factory procedure for refilling this could happen, the other issue is a blown head gasket, which if u have overheated the engine very many times is most likely what u have going on. The way u checked the thermostat is ok, but it is best to use a thermometer and watch where it starts to open, that should be around 190 degree's F.
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I did that. Ok i replaced the thermostat and temp switch i ran it and it opened and i bled the air. Now, it wants to ride in the red zone but if i drive it it goes does alittle but then climbs back up. I bled the system for ever until there were no air bubbles. But, if i run without it it runs way below normal. Could the gauge switch be bad.
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