Prior to 1999, all refrigerators used R12,commonly called "Freon". After that date due to mandates by the Montreal Protocol, the refrigerators were forced to switch to R134A, the same refrigerant used in automobiles since 1994. R134A is less efficient, and far more troublesome than Freon 12, but the manufacturers had no choice. Somewhere on your machine there is a placard that lists they type of refrigerant. Inside the freezer compartment or fresh food compartment, along the front rail of the machine behind the grille, or on the rear of the machine, many times even on the compressor itself. It will usually give the amount of charge in ounces along with the type of refrigerant. If it says dichlorodifloromethane then it is the old method of describing R12. Units in leisurevehicles running on gas instead of electricity, use ammonia.
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