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Refrigerant Oil Adding

WARNING: This page is about a different car, the 2003 Mercury Mountaineer and 2003 Ford Explorer. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION: During normal A/C operation, oil is circulated through the system with the refrigerant, and a small amount is retained in each component. If certain components of the system are removed, some of the refrigerant oil will go with the component. To maintain the original total oil charge, it is necessary to compensate for the oil lost by adding oil to the system with the new part.
    NOTE: Service A/C compressors (19703) are shipped without compressor oil.
    Fig 1: Removing A/C Compressor Oil
    G01271492Courtesy of FORD MOTOR CO.
  1. Rotate the A/C compressor shaft six to eight revolutions while collecting oil in a clean measuring device.
    • Add the same amount plus the amount collected during refrigerant recovery.
  2. For the suction accumulator/drier (19C836), drill two 1/2 inch holes in the suction accumulator/drier cylinder and drain the oil into a calibrated container.
    • Add a quantity of new oil to match that drained from the old suction accumulator/drier plus 60 ml (2 ounces) of clean PAG Refrigerant Compressor Oil (R-134a Systems) F7AZ-19589-DA (Motorcraft YN-12-C) or equivalent meeting Ford specification WSH-M1C231-B.
    Fig 2: Adding A/C Compressor Oil
    G01271493Courtesy of FORD MOTOR CO.
  3. For the A/C evaporator core (19860), add 89 ml (3 ounces) of clean PAG Refrigerant Compressor Oil (R-134a Systems) F7AZ-19589-DA (Motorcraft YN-12-C) or equivalent meeting Ford specification WSH-M1C231-B to the suction accumulator/drier inlet tube.
    Fig 3: Identifying A/C Evaporator Core
    G01271494Courtesy of FORD MOTOR CO.
  4. For the A/C condenser core (19712), add 30 ml (1 ounce) of clean PAG Refrigerant Compressor Oil (R-134a Systems) F7AZ-19589-DA (Motorcraft YN-12-C) or equivalent meeting Ford specification WSH-M1C231-B to the A/C condenser core or the suction accumulator/drier inlet tube.
    Fig 4: Identifying A/C Condenser Core
    G01271495Courtesy of FORD MOTOR CO.
  5. Add 60 ml (2 ounces) of clean PAG Refrigerant Compressor Oil (R-134a Systems) F7AZ-19589-DA (Motorcraft YN-12-C) or equivalent meeting Ford specification WSH- M1C231-B to the suction accumulator/drier inlet tube when carrying out each of the following repairs:
    • installation of a new A/C evaporator core orifice (19D990)
    • installation of a new A/C compressor pressure relief valve (19D644)
    • installation of a new refrigerant line
    • repair of an O-ring seal leak
    • repair of a charge port leak
  6. Installation of new components that do not require discharge of refrigerant and resulting oil loss, such as the A/C cycling switch (19E561) and the A/C pressure transducer, do not require additional oil.
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