bearing is shot
There is a special tool that will pull the clutch assembly off of the compressor, available at your local parts store!
It is possible to replace the air conditioner clutch without replacing the entire compressor if you can find somewhere that sells just the clutch assembly and can get the appropriate tool to remove the pulley to get to the clutch. Try buying a repair manual and looking in there.
What specific kind of vehicle do you have? It does sound like the clutch may be bad, but we also need to know what you are working on. You need to run power straight from the battery to the compressor. If is still does not engage then you need to replace the compressor and clutch, they are dead. If they do engage, then you have a wiring or computer issue.
If the clutch disengages properly then the compressor should not be running. Most likely the clutch itself is bad instead of the compressor.
The AC clutch is on the front of the compressor where the belt rides. When power is applied to the clutch it engages to turn the compressor. It is basically a magnet a/c compressor clutch is the ound thing on the front of the compressor with pulley wheel attached. this clutch is an electro magnetic clutch that when electricity is supplied, engages so as the a/c compressor is driven ,which can then pump freon thru the ac system
The ac compressor clutch is mounted on the front of the compressor and is a replaceable part. However depending on the complexity of the clutch change out it may be overall better to change the compressor and clutch together.
Check out the link below for a very good, detailed description with diagrams.
Get a reman compressor and don't bother dicking around with the lame one.
It should be right on the front of the compressor - usually the clutch is inside the v-belt/serpentine pulley on the compressor
Bad A/C compressor clutch. Bad A/C compressor clutch.
AC Compressor clutch relay may be stuck. Remove the relay and see if the clutch releases.
how do you replace the AC compressor clutch on 2006 liberty