I have a 2004 MC SS and i'm having issues with the temp gauge fluctuating alot. It almost overheated last week with hi temp coolant light coming on. Took it to a shop and they said it needed to be bled. I did that and it was okay for awhile now starting to rise again. I don't see any leaks. Thermal sensor's been changed, i don't know what else to do. All the shop said was to try to get a low temp t-stat to help.
thanks
Sam