Since I can find no sticker, I have no choice but to assume the best (the only sticker on the compressor was "Delphi" - the brand name) choice of action is the Vac and charge at the mechanic - at least that way I'll know what is in there, even if it all leaks out!

On another topic Winmutt, where did you get those rims for the grey Merc in your photo?

Thanks so much for the help everyone!

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1984 300D