Could be a vacuum problem--either broken or disconnected hose or bad vacuum motor under dash or coming in through firewall Defrost is the default position for this system
Central Air Conditioners are installed into your house to provide cooling air in every room using a duct system. They are very refreshing on a hot day.
An air conditioner blows out heat
Most of the ones that I have seen have dirty condensor coils. That's the coil you see from the outside. They get dirty on the inside of the air conditioner where the fan blows air through it.
If your air conditioner blows air but it's not cold air then you probably need freon in your air conditioner
The Air Conditioner is on
Well the main reason why your car blows out cold then hot is because the air conditioner may not be working properly. You should go to the car shop and get it fixed.
the system is probably out of coolant.
If the ambient (air) temperature rises and the A/C blows warm air, it probably means that you need to add freon.
Gert your air conditioner recharged.
Well, you can open it to find out. But mostly, you will know they are not working if the air conditioner blows hot air, or stops working all together.
I have the same problem with my 95 olds 98 regency, did you find anything out?
is it possible that the vent hose are disconected?