Since it has an air throttle, it won't respond till you have some pressure. It DID make air since he bought it??? Did the previous owner mention why it was replaced? (just in case it was changed to fix a problem and it didn't fix it, so your friend bought it? If it was working since he bought it, it probably a problem with moisture that changed to ice. Does the coach have a block heater with electricity available?
Chessie 4905.
He was told it was replaced, however it has been sitting for about 6 months, weather that has anything to do with it I don't
know. When I get more info I'll pass it along! Thanks for the reply.
Steve 5B......