Overheating?

If you feel it, smell it and hear it -- maybe it's leaking somewhere -- even a little? Have you had the cooling system pressure tested yet? Do that before anything else. Certainly the temperature of the engine should be measured for real, with a diagnostic tool first -- seeing what the engine coolant temperature sensor is reading, and then even with some kind of thermal gun to check temperature at a distance physically, to get a sense of how close it is to reality. The gauge may or may not be working properly, so it's really hard to know until you can assess all the facts. www.repairpal.com/repair-shops