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r12 will only burn in the presence of something more flammable burning [eg.gasoline] the most important reason that you don't want to convert to 134a from r12 is the molecule size of 134a.back in the 80's the evaporator cores were made of aluminum with u shaped end pcs epoxyed in.over the yrs that epoxy has petrified and the tiny molecules of 134a will find a way out of the epoxy and create a large leak in doing so.ask me how i know this.
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