Hey everybody, i need some help. I was driving my jetta on the highway when my temperature gauge went all the way up to the hottest temperature. The car didnt overheat though. I brought it to the mechanic up the block, he replaced a sencer and i think the thermastat, but that didnt fix the problem. Now, they don't know whats wrong with it. Instead of bringing it to volkswagen to pay a fortune, can someone please help me?