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What type of refrigerant is used in a 91 ford RANGER air conditioning system?

The 1991 Ford Ranger most likely used R-12 (Freon-12) refrigerant in its air conditioning system. However, R-12 is no longer manufactured due to its ozone-depleting properties. If the system needs servicing, it will require conversion to a compatible R-134a system (with appropriate modifications) or use of a retrofit kit.