[77newell]

Yea, Richard that makes sense. It really wouldn't take a lot of liquid for it to maintain that pressure, a tiny amount. The only relevance of that number is that the system is holding some pressure so it is not completely open to the air, as in having a hole somewhere. It gives me some hope, probably false, that the system can be made to work since it won't be full of corrosion.

Tom: when your 90 A/C would quit working, what was it that failed. And since your "new" coach's air seems to work quite well, how does the construction of that system differ from the 90 coach. Any insight you can provide might help me understand the likelihood that I can make my 93 system work. Of course I'll end up with a dilemma; am I willing to risk resenting chucking money down a rathole more than it niggles me that something that should be working isn't working. Ahhhh, the choice we face.