AC compressor or AC clutch
 

The sound seems like a failing bearing. When I turn off the auto climate control, the noise goes away. Seems like it appears when the AC is engaged.

Any chance it is the clutch or more like the compressor itself?

Thanks,

David

Could be either, only way to know is to pull the unit out and look,

could be also tensioner...

Thanks for the insights, I need to look closer!