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Flammable Refrigerants To Be Taken Care Of  Flammable refrigerants are illegal to use in an automotive air conditioning system. There are some exceptions, such as the new  R1234yf refrigerant , which is mildly flammable but only under certain conditions. Flammable refrigerants may also be used in the trailer refrigeration units on heavy duty trucks. But other than these, no flammable refrigerant should ever be used in a car or light truck A/C system. Flammable Refrigerant Fire Hazards Propane, butane and a number of other hydrocarbon mixtures and blends actually work quite well as refrigerants, with cooling characteristics similar to R-12, R-22 and R-134a. But if the evaporator inside the passenger compartment develops a leak, the flammable vapor may create a potential for a fire or explosion. Do you really want to risk being cremated while driving your vehicle? Another thought to keep in mind is what happens if your vehicle is involved in an accident. The A/C co...