Factory AC can work great with R-134A if you know a few secrets

brian6pac said

We started doing them around 2000 never changing any parts. Evacuate, add 8oz PAG oil and charge with R134A, worked fine never had a problem. I did my buddy's car about 15 years ago and I think we add a little R134A about 6 years ago and it still works.

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That is why I never gave up on this... my Coronet was 100% original and 4 years later it will still freeze me out of the car so I KNEW it was possible to work well... The Duster was much rougher and I thought it would be better to replace a few part with "new, better" stuff.... No replacement for original equipment parts, period.