Sorry to hear that. I just finished mine and having better luck, so far anyway.
But it's a R4 and legend has it that it could blow up anyday.
http://www.peachparts.com/shopforum/diesel-discussion/380380-r12-vent-temp-85-300d-38-5f-%40-87f-ambient.html

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85 300D turbo pristine w 157k when purchased 167,870 July 2025
83 300 D turbo 297K runs great. SOLD!
83 240D 4 spd manual- parted out then junked