My AC blows hot air, like heater hot, but the defrost on cold blows cold air. At first the AC would cut out at low rpm's (stop sign or red light) and cut back on, now its nothing. But the defrost blowing cold, enough to fog up the windshield, tells me its not the compressor or freon. Any ideas?

 

Sounds like a blend door problem, which would include a problem in the head unit. It could be opening the door to the heater core in the dash register position. Can you use the temperature **** to make the defroster air warm?

 

blend door is controlled by electric motor and adjustable from cold to hot. It mixes the air to get correct temp. Common for door, control arm, or gear box to strip out. location is under the radio, above the transmission hump. Remove plastic panels for access.