The oil for r134a is flammable, and when combusted, basically creates mustard gas- which is deadly at a few PPM. r134a runs at higher pressures so it's more likely burst and spray out onto something hot.
My last purchased car came with propane, if you've got an old car it's basically your only choice.
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Originally Posted by EcoCivic
I am probably going to try to find a better solution though since the heater hose is ugly and it doesn't fit well around the bends.
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Exhaust wrap would work. You could even wrap that in thick aluminium heat shielding. Reflect the heat before it gets there.