I'm no Mechanic but I'm experiencing the same problem and from what I can tell it has to do with the AC compressor Clutch getting stuck. Turn your car on and turn the AC on then pop the hood and look at the AC unit and if you see the it click on and then off you'll know it's the clutch. Not sure how to fix yet. Maybe WD 40 maybe new AC Clutch relay or maybe new clutch. Hope this helps.
An air conditioner blows out heat
you would need to add freon
Portable air conditioner will not blow cold air. What to do?
You have to get it recharged. you have no freeon left which makes the cold air
If it does blow just not cold air you should see if it needs to be recharged
diagram for 1999 chev subarban air conditioner
A.C. circulates air(just like a fan) and turns it cool.
gas leak or wrong wiring
absolutely because if the compressor is not engaged then it can not produce cold air.
You are low on coolant to the heater core.
Coming out of the vents around 43 degrees
i have a pioneer travel trailer, air conditioner the compressor does not come on please advise is there internal switch?