The thermostat controls the engine temperature and the coolant temperature sensor reads it and send it to the computer for other purposes rather than the cooling fans itself -when the computer picks up the correct coolant temperature it activates the fan relay to fire up the cooling fans
If I remember the one I bought last summer is the type that is not supposed to close. The thermostat is not suppose to work that way-if it stays open the engine will not reach the correct operating temperature where the computer should fire up the fans and also you'll be burning gas bcuz its locked-up in the open loop mode-not switching to closed loop-where the oxygen sensor is controlling the air/fuel mixture.
The pic I gave earlier is where the thermostat at-let me know-click on my name and send me PM
Sunday, March 13th, 2011 AT 7:53 PM