how to remove a air conditoner compressor on a 1999 buick park avenue
http://www.justanswer.com/buick/3f6uq-a-c-compressor-removal-95-park-ave-ultra.html --- maybe this will help.. but FIRST YOU MUST REMOVE OLD REFRIGERANT (IF ANY INSIDE A/C SYSTEM)
this is another write up, please read: http://buickforums.com/forums/threads/21502-A-C-Compressor-Removal
I just did a 91 Reatta (similar 3800 engine) and it was necessary to remove the radiator to have room to get it out.
This must be done by professionals who have the equipment to capture the refrigerant- there are reasons for this-
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