Anyone,
On a 2007 Trailblazer LT, is the pully on the tensioner (left side facing engine) the same pully as the idler pully (right side facing engine).
I changed my tensioner pully and still have the whine. They looked the same to me but, when I held the old tensioner pully next to the idler pully, it seemed a little smaller or bigger (I can't remember) I do remember it felt like a different size.

Thanks
Phil

 

why don't you just change the bearing in the pulley. as long as its a metal pulley, you won't damage it. the bearing is $6.

 

Or just get a brand new idler pulley, less than twenty bucks and easy to replace.