I have a 1999 e320 4matic. I had this mech who was really trying to pip me off every time I went to him, I really thing he fixed one thing and brooke something else. My problem now is the air only comes on when the weather is cool. It it is very hot out here it will not come on. In the eveing it always works. Sometimes I travel on the highway (60mph and up) and it just kick on. Please someone help me with this problem