It could also be the vacuum valve that directs the flow on the heating ducts right under the dash. I had to replace mine almost when the coach was new and it was doing the same thing. When the air conditioner was on I would only get hot air. Had the valve replaced and bingo I had cold air. Mine was manufactured by Evans. Might check to see if the flaps are moving when you press the button.
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2002 Gulf Stream Scenic Cruiser
2018 Buick Envision Essence
Neway Freightliner chassis
Aventa II Blue Ox
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