Originally Posted by Karl06greyhawk
When I'm pushing the gas while driving my motorhome my ac quits blowing air when I let off it blows just fine why is this ?? It never use to do this could it be low in freon ??
Does it instead blow air out of the defroster outlets for a bit? Many Fords use engine vacuum to operate the different "doors" in HVAC system, defrost is usually where they fail to when vacuum is low or gone.
There usually is a vacuum reservoir that stores vacuum to "hold" the settings when the throttle is open wider (climbing hills) and vacuum drops off. A check valve holds vacuum in the system when engine vacuum is low. Two things I suspect are a possible vacuum reservoir or check valve problem.