The dash air on those older coaches is really a pain and could be costley to fix. On my 88 I converted it and it still is useless, so I run the generator and the house units to cool the coach which works fine. As far as the air leaks, I changed every check valve, air switch, preasure guage and switches in the coach and mine is lock tight. Did it all with a friend and it was a little expensive.
Good luck with the repairs and do them as you can afford to. Some are necessary for being on the road.
Wally
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Wally and Phyllis
1988 Newell Coach #163
40' with tag 8V92
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