[slowcpe]

Are you talking about the blend door? They are known for their issues. Mine would get stuck and wouldn't adjust unless the truck was turned off for a while. I actually never fixed it, just adapted. Get on the Tahoe-Yukon forum. A lot of good info there.

I had a 2000 nbs Tahoe and it was a great vehicle. Sold it a couple of years ago with 267k and its still going strong approaching the 300k mark.