AlaskaYukon
TYF Newbie
Alright so today I started my day using the heat in my 2004 Yukon which worked as it should but as the day went on I switched it over to AC but it continued to blow heat out of the drivers side vents only. I shut the whole system down and later in the day went to turn on the heat again but this time it would only blow cold air out of the vents only on the drivers side once again even though I shut the AC off. What could be causing this?