My 87 Gran Fury when I put the AC on warm air blows out of the defroster vents I know it needs freon but shouldn't it blow out of the AC vents hot air when set on AC ?
Not fully sure how that one works. If it's the same as the Chrysler one it's semi automatic with a sensor an motorized blend door that can fail and cause issues. And the vacuum lines behind the controls can get brittle and break but doesn't seem to be as much of an issue in places like NY.
I think the owners manual if you have it says what the different settings do.
its probably a pain to get that switch panel out it always stays on defrost remember on the older cars you could go under the dash and flip the door with your hand not sure about this car
Sounds like your blend door actuator might be stuck or the vacuum lines are shot - those old Mopars are notorious for vacuum leaks that mess with the HVAC controls.