Chevrolet Repair: 2004 Tahoe AC blowing hot air, circut board, dual controls

Question
This just started, it happens on vent and on AC, the drivers side begins to blow hot air - really hot air.
If I restart the engine it goes back to cold air.
Sometimes the Tahoe is running only a few minutes when this starts, or it could be an hour and it happens when the Tahoe slows down.  It's typically only the drivers side, there are dual controls.
Thanks for the advice


Answer
Hi Jim... check the actuator for the dual controls....make sure it move when you cycle the controls.... sometimes they will bind and hang up. no reason that it should change on it's own other than maybe bad control centre circut board... hope this helps