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Converting an R-12 system to R-134a is a little more complicated than simply having the R-12 recovered and replacing it with R-134a. Most people (especially with vehicles old enough to still have an R-12 system) don't want to put in the money it would take to do a proper conversion to R-134a. So they replace the compressor oil, seals, and fittings, and leave it at that. Which is sufficient.

R-134a is slightly less effective than R-12, but it works. System pressures will be higher (which is why parts need to be replaced when converting to R-134a). It's much less flammable than R-12, considerably less toxic, and it does what it's supposed to.

AC systems are not DIY work. The refrigerant has to be recovered, and you're also going to want to do a system performance test both before and after the conversion to ensure that there are no leaks or other deficiencies with the AC system.

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13y ago

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