This noise is most noticable at start up and then continues on for another 20 minutes or so. I wonder if it's the belt tensioner pull bearing? Do those go bad very often. Hopefully it's not the alternator or AC compressor or even the water pump.

The car is a 2007 and only has 69,000 miles on it. Does anyone have experience or a suggestion for this?

Thanks.

 

Check this video:

 

After 19yrs…….I’d simply replace the belt and pulleys. An easy job if you’re handy.