While I had my engine out and doing things to it, I put on new compressor, drier, cleaned out condensor and lines, put in some new o-rings and recharged with 134a and ester oil. My little 380sl never cooled better! I did not have to change expansion valve. Like I said, it works great. If anyone has problems with their system, I would suspect a weak link somewhere else in the over all scheme.
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