If clutch does not engage when power and ground are applied to it and when engine is off you can turn the center/input part by hand then it indeed sounds like a faulty clutch or coil.

All of the parts on the front of the compressor can be replaced without opening the system. (Clutch, coil, pulley usually sold as a kit)
I will try to cut\paste the service info.

Gary.


6. Carefully remove the compressor clutch field coil connector and wire lead from the connector bracket (2).
7. Remove the compressor shaft bolt (3). A band-type oil filter wrench or a strap wrench may be used to hold the clutch plate (4) from rotating during bolt removal.

CAUTION: Do not pry between the clutch plate and the pulley and bearing assembly to remove the clutch plate from the compressor shaft as this may damage the clutch plate.

NOTE: Use care not to lose any clutch shim(s) during removal of the clutch plate, as they may be reused during the clutch plate installation process.
8. Tap the clutch plate (2) lightly with a plastic mallet to release it from the splines on the compressor shaft (1) and remove the clutch plate and shim(s) (3).

9. Using Snap Ring Pliers 9764 or equivalent (1), remove the snap ring (2) that secures the pulley and bearing assembly (3) to the front of the A/C compressor and remove the pulley and bearing assembly.

10. Using Snap Ring Pliers 9764 or equivalent (1), remove the snap ring (4) that secures the compressor clutch field coil (2) to the front of the A/C compressor (3) and remove the field coil.