Refrigerant Oil Addition
During A/C Compressor ReplacementWhenever the A/C compressor is replaced and evidence of debris is present within the A/C system, the following must also be performed:
^ Replace the suction accumulator/drier.
^ Replace the A/C evaporator core orifice.
^ Clean the A/C system by flushing or filtering.
NOTE: Service A/C compressors are shipped without compressor oil.
When reinstalling the existing A/C compressor or installing a new one, the A/C compressor must be serviced with the correct amount of Motorcraft YN-12b refrigerant oil or equivalent meeting Ford specification WSH-M1C231-B as follows:
1. Obtain a clean container that can also be used as a measuring device.
2. Place the A/C clutch on the A/C compressor shaft so the shaft can be rotated.
3. Rotate the shaft by hand six to eight revolutions, collecting the oil in a clean measuring device.
4. If the amount of oil drained from the old A/C compressor is between 89-142 ml (3-5 ounces), pour the same amount plus 30 ml (1 ounce) of clean Motorcraft YN-12b refrigerant oil or equivalent meeting Ford specification WSH-M1C231-B into the new A/C compressor.
5. If the amount of refrigerant oil that was removed from the old A/C compressor is greater than 142 ml (5 ounces), pour the same amount drained of clean Motorcraft YN-12b refrigerant oil or equivalent meeting Ford specification WSH-M1C231-B into the new A/C compressor.
6. If the amount of refrigerant oil that was removed from the old A/C compressor is less than 89 ml (3 ounces), pour 89 ml (3 ounces) of clean Motorcraft YN-12b refrigerant oil or equivalent meeting Ford specification WSH-M1C231-B into the new A/C compressor.
During Component Replacement
When replacing a component of the refrigeration system, follow the correct procedures to make sure the total oil charge is correct after the new component is installed. During normal A/C operation, oil is circulated through the system with the refrigerant and only a small amount is retained in the A/C compressor. If certain components of the system are removed for replacement, 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 replacement part.
Add 60 ml (2 ounces) of clean Motorcraft YN-12b refrigerant oil or equivalent meeting Ford specification WSH-M1C231-B:
^ following replacement of other system components such as hoses, A/C evaporator core orifice, A/C cycling switch, A/C compressor pressure relief valve and A/C pressure cut-off switch.
^ following minor repairs such as O-ring leaks, charge port leaks, compressor shaft seal leaks and hose leaks.
For the A/C evaporator core, add 89 ml (3 ounces) of clean Motorcraft YN-12b refrigerant oil or equivalent meeting Ford specification WSH-M1C231-B to the suction accumulator/drier inlet tube whenever the A/C evaporator core is replaced. This will compensate for the refrigerant oil lost in the replaced A/C evaporator core.
For the A/C condenser core , add 30 ml (1 ounce) of clean Motorcraft YN-12b refrigerant oil or equivalent meeting Ford specification WSH-M1C231-B to the A/C condenser core or the suction accumulator/drier if the A/C condenser core is replaced.
When replacing the suction accumulator/drier in conjunction with another component of the refrigeration system, measure the amount of oil drained from the removed suction accumulator/drier into a suitable container.
^ Drill two 13 mm (1/2 inch) holes in the bottom of the suction accumulator/drier to drain oil.
^ Add the same amount plus 60 ml (2 ounces) of clean Motorcraft YN-12b refrigerant oil or equivalent meeting Ford specification WSH-M2C231-B.