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My car was converted to 134 under prior ownership a long time ago, I’m guessing maybe 10-15 years.
It was what I’d say was a “50 percent” conversion.
They kept the stock compressor, condenser and fan, and I don’t think they took out the evaporator.
Most of the orings were green, but some of the deeper ones, like on the expansion valve and evaporator, were still black.
AND I know the AC hadn’t been touched at all in the last 5 years (no refills, nothing).
AND, when I took out and flushed the evaporator (after removing the xvalve of course) I found it was partially clogged. The flow was poor until the flush fluid and compressed air blew out the clog.
Yet, it somehow actually still cooled somewhat.
I only started to have second thoughts on 134 v R12 because the new Sanden comes factory filled with PÁG oil, and I’m ready to charge it, so I’m sort of at the “point of no return” on 134 v R12.
In doing a ton of reading I’ve found mixed results with R134 conversions, but in the end I think that’s because to do the conversion really correctly, including the hardware choices (upgrading the condenser and fan, etc), the execution in putting it together correctly, and filling it correctly (clean dry system, no leaks, no moisture, no air in the system, correct amount of 134, etc), most DIYers don’t get it 100% right.
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