If it's HOT air, you have a stuck temperature blend door. It's stuck open to the heater core (which is always hot, even when you aren't using it.) I would test for a working temp blend door first, as well as test for a refrigerant leak.
How do you test for a working temp blend door?
With the engine off but ignition on or in ACC, try moving the temp from hot to cold, and listen for the sound of the door moving. If it's impossible to determine you may have to peek inside the dash where it is located, in many models you can get a glimpse of the top of the hvac box by removing the passenger airbag and/or glove box. You'll have to look up were it is for your specific vehicle. The blend door itself is controlled by an actuator module (which is basically a tiny geared motor) pushing on the blend door's lever rod. Usually what happens is the actuator fails and has to be swapped out.
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