So I parked in a parking garage this morning for about 45 minutes, came back and proceeded to make my way down the garage to the exit. I notice my temperature gauge was on red and once I exited the parking garage, the temperature gauge went right back to the middle where it usually is. This is the first time I have seen this happen. Is this something I should be worried about? Anyone know what might be the problem? My car has 82,3** miles on it so is it time for a thermostat replacement/overhaul?