Hi everyone!
I'm on my second Grand Prix...been pretty happy with both!

I am having issues with a 98 GTP that i own. It has 175k on it...still feels pretty strong!
My car starts to over heat when it is sitting at idle. When i drive the temp is normal. When it starts to overheat at Idle and i turn the heat on and rev to like 2k rpm...the temp goes down to normal.

I have checked the radiator fans and they do kick on..both of them. I Just replaced the thermostat and that didn't help.
Any ideas?