The truck had been sitting for about 3 days, which is rare. I heard the squeal in the video. I think I have heard it before, but not for a while. Almost sounds like it might be coming from the Idle Pulley. Its present around 11 seconds in and really pronounced in the last 6 seconds. Where do you think its coming from? Again, rarely hear it. Thanks!

 

How many miles is your truck? The sound I'm hearing does sound like a pulley bearing going bad, but its certainly not a squeal.

 

Just over 125000 miles. Squeal was my best description..

 

pull your belt and run it. If it goes away it is a pulley.

 

Sounds like the AC kicked on when the sound is heard. Most likely compressor clutch.

 

Yea, take the belt off if the sound is gone you'll know it's a FEAD component, just have to figure out which one.