ANSWERS: 2
  • I have a 2004 Yukon with the same exact problem. I can only get it to go back to ac if I shut off the car and restart it. Did you ever find a solution?
  • I had this happen again so I drove it straight to the dealer. They said it had a short in the control board and replaced it. Just under $400 for part/labor. It seems to have worked.

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