Howdy everybody been a while since I was last on. This problem has slowly gotten worse. I noticed when I start up the truck I hear a faint sound, it sounds like the belt squealing. So I took the belt off it looked completely fine. But the tensioner pulley and Idler pulley were getting bad, so I replaced those as well hoping this noise would go away. Got every thing put back on and still the same noise. Any ideas on what it could be would greatly be appreciated.

 

Take the belt back off, and spin everything else by hand. See if anything doesn't feel quite right.