looks like I am sold on retaining the R12 system. so, right now, due to compressor leaking, I am told that there is no R12 left in the system. The system now is 'Flat'. I plan on replacing the compressor, drier and expansion valves. Any tips on the procedure on how to go about it? I have dealt with a lot of DIY on my 91 560SEl but this will be the first time for an AC rebuild for me. After changing all parts do I still need to evacuate before it can be re-charged with R12?

There a a few re-built compressors sold on EBAY. Are these any good?

thx,