To begin with, you said you charged it? I assume this is an R12 system converted to R134a. If so, what percentage of the R12 refrigerant weight did you charge with R134a.

Secondly, blowing out the lines with compressed air, then letting them set, made for a VERY contaminated system. Even with a fresh r/d, I would be concerned about it. It would be better to sweep the system with nitrogen or some other inert gas. In the old days, we swept them with a short blast of refrigerant, but that is illegal today.

PAG is not the best oil for a converted system.

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2014 Porsche Cayenne six speed manual

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