It's a bad bearing on either your alternator or your A/c. The first alternator I replaced had that; bad bearing and barely worked.
You need to disconnect the driver's side wheel, the plastic covers for the engine bay, then the alternator and lower bracket. You'll eventually get it pointed in the right direction for it to come out the wheel-well.
In my experience, the Mitsubishi alternators always went bad. Try to not get one for a replacement.
I got a new shell, just need to stop driving the DX so I can work on it.
I've got a filter for my mouth, it just isn't a good one.