Another guess the noise thread

Before I pull the serpentine belt off. Anyone experience this noise and know if it is likely the belt or a pulley? Doesn’t really show up when at idle, but gets awful once you accelerate.

https://youtu.be/6SQHbci6aRg

 

My vote is a bad pulley bearing.

Pull the belt and spin the pulleys by hand. You'll be able to feel that one.

 

thanks. I’m guessing I could even just remove enough tension on the belt to spin the pulleys by hand. Thanks for the idea!

 

Here's a good video on how to change your serpentine belt. (For V6 4.0L 2nd gen -- if you have a different engine, look for a different video. But the basics are the same: you can relieve tension on the belt via the tensioner pulley, and that will allow you to spin other pulleys by hand & possibly locate a bad one. (If it's a pulley..)

https://www.youtube.com/watch?v=ZKq3FBsvFsI

 

Of course the squeal stopped again yesterday after I decided to spend time trying to figure out the cause.
Next time it squeals I’m removing the belt and spinning pulleys.