Thanks so much, folks, for your recommendations. I haven't heard back from the mechanic for a couple of days, and I don't have a warm fuzzy that they know what they're doing. By the way, I'm using Freeze 12 as a refrigerant - it works great in R-12 systems. By the way, if I should run into a peppy zone somewhere, what is the precise model of compressor that I should ask for?

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1983 300D (Hans)