Strange Sound from engine

Can someone please tell me what this is? http://youtu.be/TG6YCjL9Cpg

It sounds like a bearing going out.

 

how many miles on it. maybe one of the pullies, or altenator. unhook your belt, see if noise goes away.

 

sorry.....180k

 

My $.02 would be a water pump.

 

First impression is a AC unit starting it's horrible howl when the clutch kicks in and it is failing. Kinda hard to tell from the video.

How many miles or hrs on the sound?

 

Best way to tell is to take one belt off at a time until the sound stops they you know exactly what it is without through away $. I had a similar noise and thought it was either water pump or a/c. Started by take 1st belt off and found out it was a bad bearing in my power steering pump. Good luck.

 

Could be the power steering idler pulley.