Relatively easy for an experienced mechanic, consult the manual for specific instructions.
You cannot change the compressor bearing, however, you can change the clutch bearing. Which one is bad? Is there a noise when the clutch is engaged, or not engaged?
Get a reman compressor and don't bother dicking around with the lame one.
bad clutch bearing
How do i remove an air compresser in a GMC Cheyene
You need a special tool to remove and replace the clutch. Your local auto parts store can sell or maybe rent you the tool.
could be a bad bearing on the air conditioner clutch assembly.
no
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chevy impala
AC clutch relay is inside the fuse case within the engine compartment.
You are low on refrigerant, google R134a...
Low or no freon will cause the AC not to work. Also if the clutch on the AC compressor has failed, or if the compressor itself failed.