I have a 95 E320 mercedes which was in an accident. Went through repairs with the only clitch being the heating/air not working in the car as well as the mechanic being unable to connect the computer to check climate control or engine. Please, I really need some help. I do not want to go the mercedes dealer since they charge an arm and a leg to diagnose and fix the problem. Any suggestions would be greatly appreciated as to how to diagnose the problem. The fuses are alright.