The thermostat is for getting the best optimal operating temperature of the engine and SHOULD NEVER be removed.
If it is bad, it should be replaced. Without the thermostat, the coolant are free flowing and that would result in inconsistent temperatures. When driving in heavy traffic, the radiator fan switch is delayed coming on as the radiator is being cooled fast and giving a false reading of the coolant temperature.
You would need to check if there are air trapped in system and if the cooling fans are operating correctly.
Wednesday, June 23rd, 2010 AT 2:36 PM