Odds are, there's been some violation in there. And while 134a is the generally accepted kludge, the EPA does not certify it as a drop-in replacement for R12. There are several gasses and mixes that will "work" to varying extents. If you didn't such down a hard vacuum on the system before you filled it? Problems. If you did suck down a hard vacuum? Are you sure it was just air in the system? No old residue of gasses, each requiring a different manifold and disposal tank?
Personally I suspect than manufacturing a whole new system instead of repairing an old one does MORE damage to the planet and I disagree with many of the regulations
. I just point out in passing that if you don't know the laws and don't have the permit(s)...you've probably broken at least one of them. Like charging
a system without first pressure-testing it to make sure any leaking has been stopped. And if any of those cars you retrofitted didn't belong to you? KaChing, you need a pemit to do that. It isn't hard or expensive to get, but if someone complains about the job not working, it could come back to bite you.
Apparently there's bigger BS involved. The production of R22 creates R23, and companies make big money
from credits when they dispose of the far nastier R23. Guess what? I turns out a dozen big companies have been selling R22 really cheap
, because they make their profit on the R23 they dispose of as a byproduct of making R22!
I personally couldn't care, just hope you "did it right" so the next fill lasts at least ten more years--which should be easy for any proper AC/reefer system.