What is this squealing sound?

Car has been doing this quietly for a couple of weeks and it just got much louder and more constant. Any idea what’s causing this sound?

https://www.dropbox.com/s/mo3uyvrd5b1frgz/Video%20Nov%2015%2C%208%2025%2053%20AM.mov?dl=0

My best guess is that the bearings in one of the belt pulleys are going dry. While this is not an emergency situation, I suggest that you have your mechanic check the situation when it is convenient for you.

If the bearings seize-up, you may wind up having to replace the belt also, so sooner is better than later.
How old is this Kia?

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Thanks. It’s a 2006 Sedona. I just noticed the noise seems to have mostly subsided since it’s been running/warmed up.