Review on Dorman 604-706 HVAC Blend Door Actuator: Ideal for Cadillac, Chevrolet, and GMC Models by Bishop Roshad

Cool AC air stops blowing into the driver's side vents. After some research it turned out that the problem usually lies in this actuator. The dealer charged $1,100 to replace the broken one. They said the entire panel would have to be removed to replace it. Not true. You can replace it by going through the hole in the glove box. There are a few YouTube videos showing how to do this. It hurts, but you can still do it. Took me a little over an hour. I bought a Dorman and not the original Delco AC because it has a lifetime warranty. The air now blows cold air out of the driver's vents and it works well.