Refrigerant Oil Addition
R-134A REFRIGERANT OILCAUTION: Do not add R-134a refrigerant oil to an R-12 system. Also, do not add R-12 refrigerant oil YN-9 to an R-134a system. Mixing these two types of refrigerant oils may cause poor lubricant circulation, resulting in component failure and damage to the A/C systems.
The refrigerant oil required for R-134a A/C systems is a Polyalkalylene Glycol (PAG) oil, PAG Compressor Oil Motorcraft YN-12c F7AZ-19589-DA or equivalent meeting Ford specification WSH-M1C231-B. This type of refrigerant oil was made specifically for R-134a systems and is not suitable for use in R-12 systems. Never use R-134a refrigerant oil in R-12 systems.
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.
If the A/C evaporator core is replaced, add 89 ml (3 ounces) of clean PAG Compressor Oil Motorcraft YN-12c F7AZ-19589-DA or equivalent meeting Ford specification WSH-M1C231-B to the suction accumulator/drier inlet tube. This will compensate for the refrigerant oil lost in the replaced A/C evaporator core.
If the A/C condenser core is replaced, add 30 ml (1 ounce) of clean PAG Compressor Oil Motorcraft YN-12c F7AZ-19589-DA or equivalent meeting Ford specification WSH-M1C23 1-B to the A/C condenser core or the suction accumulator/drier.
When replacing the suction accumulator/drier in conjunction with another component of the refrigerant 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 PAG Compressor Oil Motorcraft YN-12c F7AZ-19589-DA or equivalent meeting Ford specification WSH-M1C231-B.
OTHER REFRIGERANT SYSTEM COMPONENTS
Add 60 ml (2 ounces) of clean PAG Compressor Oil Motorcraft YN-12c F7AZ-19589-DA 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.