I just picked up my SC last week and didnt have A/C. My R-12 had leaked out and my compressor would'nt even come on. A few days ago I did a search for a/c service and it led me to some posts about a product called Duracool. I did a little research and was able to contact the distributor for my area (metro detroit) He not only sent me info, he sent me three cans of the product for FREE!! I'm here to tell you that this stuff works!!! My black on black 90 SC gets colder than my 2000 Expedition. Its compatible with r-12 systems and the only thing I had to do was get my system vacuumed down and I needed to by a r-134 fitting for my low side valve so that I could put the Duracool in. The distributor would be happy to talk to any of us and send us product. His web address is www.ja-ran.com/duracool.html. Be sure to let him know you saw it here so that he can hook you up like he did me.