Nasty compressor noise

[AudiJeep@aol.com]

Ever since my AC was repaired about 2 weeks ago, the compressor has been
making an awful noise when engaged. When I turn on the AC, the compressor
makes a grinding noise. There also seems to be some vibration associated from
the noise. The repair shop tested the compressor when they repaired the AC
and informed me it worked just fine. The reason the AC was not cooling
properly was due to the fact that the system was overcharged. After removing
some of the R12 to the proper amount, the AC is cold. But now there is this
damn noise and vibration. Also, the noise and vibration is noticeable when
stopped and the AC running. Any ideas to what might be causing this?

Craig
'92 100S (64k)