Toyota R–12 Air Conditioner System Retrofit

The following information should be used for guidance when retrofitting vehicle air
conditioning systems from R–12 to R134a refrigerant.
• 1986–1989 Van, 1986–1992 Cressida & Supra, 1986–1993 Camry, Celica,
Corolla, MR2, Tercel, 4Runner, Land Cruiser, 1986–1994 Truck, 1991–1993
Previa, and 1992–1993 Paseo
A. Refrigerant and Oil Charges
• Oil and refrigerant charge amounts are different after the R–12 system has been
retrofitted to R134a. Refrigerant charge amounts are less, while oil charge
amounts are greater, compared to R–12 system requirements.*
B. System Performance
• A slight decrease in system performance may be noticed on some vehicles under
certain operating conditions.
C. Refrigerant Pressures
• R134a high side pressures are greater than that of R–12 above ambient
temperatures of 68.
D. Flushing Requirements
• There is no need to remove or flush R–12 mineral oil from the system. Simply
charge the system with the specified type and amount* of PAG oil to provide
proper lubrication.

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