My 2000 Grand Prix GT (non-supercharged) had had issues running hot. Finally i got sick of waiting money trying to fix it myself and took it to a shop to get looked at. What happens is it has a 180 thermostat so it should run around that temp... but mine will ride around 195. Thats not bad at all. but the problem is when im idling or stopped in traffic it will get all the way up to 235 and drop back down. I've already replaced all the obvious; new thermostat, water pump, radiator, flushed and filled system, new temp sensor, fan relays and theres no blown gaskets. So i basically have a brand new cooling system. So anyways i take it to the shop and they hook it up to some computer thing and turns out my car is absolutely fine. Its not actually overheating. My gauge is wrong.. but it has a brand new temp sensor. SO I'M STUMPED! Anyone got advice?? All i can think is my new temp sensor never worked or i have either a bad gauge or wiring to the gauge.. PLEASE HELPPPPPPPPPPP
