Anyone else having problems with blower damper door(s) not functioning properly. I have all ready had the driver side door actuator replaced on my 07 Yukon. Only hot air would come out the vents no matter what the temperature setting. Happened 3 times before I took in to dealer. Now today while driving to town, the passenger side 2 front vents started blowing hot air. Turning off the A/C and back on did no good. Finally turned the ignition off and back on and problem corrected itself. Will watch it and see if does it again. Strange.