I am pretty new to this stuff so be kind. I have a 2003 pontiac grand prix and I am having trouble with my Cooling system. My fans are not turning on and while I am in idle the temperature gauge keeps rising. How do I go about fixing the problem? I think possibly that my thermostat is sticking too, but not sure. Can any one help. Also just FYI my mechanic put a new engine in last year and instead of putting the dexcool in he put in the green stuff. he said it doesnt matter and in fact the dexcool actually tends to do more damage. could this have effected my thermostat and fans?