07 Yukon AC Switching from Panel to Defrost

[DeeNelson]

My AC is intermittently switching from panel to defrost on its own. The only way to switch it back is to turn off the truck and start it back up. Nothing on the control panel shows the change. It will do it 5-6 times in a day then have no problems for weeks. It doesn't effect the rear air. Any ideas?

 

[NathanJax]

Your blend door actuator is failing.

 

[DeeNelson]

Thanks, I'm going to grab the part and replace it today.