Why does my air conditioner in my car blow out hot air? one minute, it'll cool just fine and the next minute, it blows out hot air.

Check limit or safety switches

Could be a blend door problem under the dash.

1--BLEND DOOR NOT SEALING PROPERLY
2--FRONT CONDENSOR PLUGGED UP WITH DEBRIE
3--FRONT CONDENSOR NOT TRANSFERING HEAT (SPRAY WITH GARDEN HOSE WHILE ---RUNING SYSTEM IF IT WORKS BETTER CONDENSOR MAY HAVE TO GET CHANGED
4--WRONG CHARGED WEIGHT IN SYSTEM
5--COMPRESSOR CYCLE TIME NOT CORRECT
6--IF COOLANT CABLE VALVE ON SYSTEM MAY NOT BE CLOSING CORECTLY
---TRY PINCHING OFF THE COOLANT LINES TO HEATER CORE

blowing hot air is the unit's way of further cooling its compressor, this should not last long and should cycle back and forth

thats why they sold it, it is low on freon.

car air conditioner blowing hot air , this kind of problem often cause by a refrigerant leak or clogged condenser.

Sounds like your freon has leaked out and your heater blower resistor is burned out. Deffinitly take this to the dealer.

Either the unit is really dirty or it is low on refrigerant. A unit tha is low on refrigerant will start off cold and withing a few minutes, start warming up. If you aren't seeing any water its because of one or both causes listed.

Water in the pan is normal, this is the humidity removed from your space. Pan must be emptied regularly. If the unit shuts down after 15 minutes, you may have a blocked hot air duct. Make sure it is flowing freely. This includes makeup air from outside the room to replace that blown outside by the AC.