There is absolutely nothing wrong with a 134 type system. I have 2 of them in our daily drivers (both Nissans) and the Vintage Air system I purchased to go into the GTO is 134 as well. And I live where cold AC is used a lot. The only complaints I have heard are from R-12 systems being converted to 134. I can only guess that the conversions (for whatever reasons) simply dont work.
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