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Why not fix your system and install R12? Yes its tough to find, but works very well and will last a long time. It can be found. To do the proper conversion, it is sometimes cheaper vs labor to simple install new parts. There are flushing systems in the trade field not available to regular walk-ins at the parts store. They are decent and do work. If the $400 estimate included a full flush, new freon, new O rings and accumulator, Thats a good deal.
Comparable freons like Freeze 12 do work but some are propane based which not dont cool as well but in some cases destroy the compressor shaft and bushings therefor killing the compressor. I have had success w/ freeze 12 but it gets cool, not cold.
Is there a Sanden / new style compressor conversion for 3rd gens?
Somehow most A/C system repairs are always around 600-1000. Parts arent cheap.
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