Posted some time ago about a "air or whirling" noise coming from front of my z71. Last week my PS went out, from the front of the truck the pulley on the far left came off the belt came off as well. My brother had to put a new belt and tensioner on the front cost me about $80 for belt and tensioner from Chevrolet (he works for Chevy) he got autozone belt but the tensioner autozone had was plastic so he got a steel one from chevy.

noise is gone.