1987 Coupe Deville
My system seems to leak out a full charge after a month or so. This is the current condition, and the subject for another post. What has persisted is the inability of the system to send cold or cool air through the upper vents. I've had to rig an eye bolt, wire and dowel to the up-down door to get the air where I want it. I thought the problem might be the vacuum motor, so I pulled the vacuum connection from the programmer and tested that line with a vacuum gauge. It worked just fine. The system is getting good vacuum also, about 18 inches. Does this mean the problem is with the programmer? Other posts seem to say that they seldom fail, but, after all, this is a 34 year old car.