went to an a/c shop today. they specialize in nothing else. their advice was to remove compressor, drain as much oil as i could (leave upside down overnight), plug all the lines while doing this, put it back together and they will convert it back to r-12. i'll post back here with the final results next week. plan to pull the compressor on friday or saturday.

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"the simplest answer is usually the correct answer"

1991 190e, 2.6 (helga)
91,000 mi