whoa ...gentlemen gentlemen this is getting waaay off topic. the thread (i know believe me..!) is about GLOW PLUGS!!! and smoke at startup ...and a very good diagnostic tool that a lot of members can benefit from.
there's plenty of other threads about AC .. just do a search on R-12 alternatives , lol.

now, please, play nicely or i'm sending this thread to cyber oblivion...

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1984 300D Turbo - 231k....totalled 11/30/07 RIP