I need some advice as to what could be the problem with my A/C system.
The A/C in my 1988 300E quit working, and I have not been able to get the compressor to engage. However it has engaged on a few occasions (3-4 times) when the car was being driven at highway speeds, 75 plus MPH. At that time the A/C starts working and works the way it always had. However as soon as I slow down or stop it quits and does not come on again, even if the speed is increased. Any suggestions would be greatly appreciated. Thanks!