Could my temperature sensor be broken? It always stays in the middle. Sometimes, when I leave it outside for a while, and the car heats up, and when I start it during those conditions, the temp. guage drops ALL the way to cold, but then rises back up in a few minutes. When I start the car, though, after letting it sit overnight in my car hole, it is in the same position as it was when I turned it off. Are there any solutions to this?