2005 Yukon XL SLT It finally happened again, and I checked all vents.... Once in a while the driver's dash vents go total hot, but every other locations are nice and cold, passenger side cold. I shut off the engine, then after restarting, it "fixes itself"... ( Thank gosh!! ) Where exactly is that actuator?? I will have to dig into it to replace it... sometime. Or is it more than just replacing the actuator?