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Re: How can you spot a r134 AC conversion?
Not an expert. I have read many threads on this forum on doing the conversion as I expected my system to fail years ago. The compressor developed a whirring noise shortly after installation. But the value of the R-12 used to fill it was more then the price on the compressor. Thing has been cooling and whirring for well over a decade. I even have a conversion kit I purchased at an end of season sale. Probably now qualifies as NOS.
Some constants in the conversion threads was flush and change the old oil, that R-134a is a lot less tolerant of air in the system, and R-134a also less tolerant about the charge amount compared to R-12(IIRC - you need LESS R-134a then R-12 for the same system.)
A gauge on the high pressure side would let you monitor the pressures as you fill via the low pressure port. Possible who ever filled the system used a R-12 high gauge and just knew the proper numbers. Also possible they guessed and it never cooled properly.
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