Before ordering anything, do the following:

1) Inspect the clutch plate. You'll likely find it has separated.
2) Remove the serpentine belt.
3) Remove the clutch plate.
4) Spin the pulley by hand to see what the condition of the bearings might be.

If the bearings are rough, replace both the pulley and the clutch. USE ONLY A MOTORCRAFT CLUTCH PLATE unless you can easily return the parts . Pulley and bearing are under $100 from forum sponsor Rockauto. Both can be replaced in-vehicle without having to mess with the sealed refrigerant system.