Refrigerant Capacities (In Ounces): VOLKSWAGEN Model.......'86........'87......'88......'89......'90......'91 Vanagon...42-46....42-46..50.7....50.7....50.7....52 Remember that, when dealing with HC12A, the quantity is divided by 2. So, the 52 ounces required of the 91 Vanagon becomes 26 ounces.