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It could be that the temp. control cable has become disconnected from the flap that diverts the air flow from the evaporator to the heater core.(which is most likely the problem) Or the flap itself has stuck/broken. Or maybe the A/C system has become stopped-up at some point. Maybe at the orifice tube(the screen may have blown out or cracked). Check the pressure on the low side AND the high side. If the pressure is excessively high on the high side it will probably be the orifice tube clogged up. But I would ckeck that the temp. control cable and flap is operating correctly. Disconnect it from the control assembly and operate it by hand, you can tell if the flap is opening and closing much easier.

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Q: 1999 Chevy Cavalier started blowing hot air freon is fine and ac compressor is coming on what else could it be?
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