I am looking for some instructions with photos or anything of how to replace the A/C compressor on a 1990 Buick Regal GS 3.8 V-6.Anything would be helpful.
When I look under the car I can not see the compressor.From the top I can see where the belt runs.

Look under the front of the engine you will need to work from the bottom, try autozone.com, repair guides for gen'l info.

Even worse from there.I can't see nothing but the bottom of the radiator.As if the frame is blocking everything.Even after removing the plastic guards.

you're going to have to remove the radiator cooling fans to get at the compressor on that car, it's jammed in there in a nasty spot (bottom front).