I had the same control in my sierra p/u, i looked into switching to the auto control like in the escalade/denali and the wiring and hvac housing is different. I have read where it has been done on other forums, by finding a scrap yard vehicle and removing the harness and housing.
The intermediate steering shaft can make that noise. Mine would do it when turning, Gm replaced it twice under warranty. Noise never came back after second replacement.
My wifes yukon would only leak when parked, if it was a light rain, it would not leak. I checked the drains, both were draining when i ran the water hose on it, so i replaced the sunroof seal, still had the leak. I removed the interior trim and traced the drain hoses, I found the driver side...
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