Hello Y'all.
This is an awesome write up. I had the issue of my HVAC only blowing hot air. I have a 2000 GMC Xtended Cab z71. I ordered the part from Rock Auto, and replaced the old actuator per the instructions. I did have a forth screw in the trim towards the driver side that I almost pulled out that needed to be removed. As far as replacing the housing, I recommend replacing the center screw over the hump first as you can flex the trim and line up the screw and then the others are fairly easy.
Thanks again for the post!
