Refrigerant Oil Addition

NOTE: When replacing a component of the refrigerant system, the procedures must be followed to ensure that the total oil charge in the system is correct after the new part is installed.

When the A/C compressor is operated, oil gradually leaves the A/C compressor and is circulated through the system with the refrigerant. Eventually, a balanced condition is reached in which a certain amount of oil is retained in the A/C compressor and a certain amount is continually circulated. If a component of the system is removed after the system has been operated, some oil will go with it. To maintain the original total oil charge, add oil as required to the new replacement part.

The procedures for replacing oil are as follows:
During A/C Compressor Replacement
A new service replacement FS-1O A/C compressor contains 207 ml (7 oz) of refrigerant oil. A new 1OP15F replacement A/C compressor contains 43 ml (1.4 oz) of refrigerant oil. Prior to installing the replacement A/C compressor, drain the refrigerant oil from the removed A/C compressor into a calibrated container. Then, drain the refrigerant oil from the new A/C compressor into a clean calibrated container.
^ If the amount of oil drained from the removed A/C compressor was between 90 and 148 ml (3 and 5 oz), pour the same amount of clean refrigerant oil into the new A/C compressor.
^ If the amount of oil that was removed from the old A/C compressor is greater than 148 ml (5 oz), pour 148 ml (5 oz) of clean refrigerant oil into the new A/C compressor.
^ If the amount of refrigerant oil that was removed from the old A/C compressor is less than 90 ml (3 oz), pour 90 ml (3 oz) of clean refrigerant oil into the new A/C compressor.

NOTE: The suction accumulator/drier and A/C evaporator core orifice should also be replaced when the A/C compressor is replaced.

During Component Replacement
When replacing other components of the air conditioning system, measured quantities of the specified refrigerant oil should be added to the component to ensure that the total oil charge in the system is correct before the system is operated.

Clean refrigerant oil should be poured directly into the replacement components as follows:

NOTE: Whenever an A/C evaporator core is replaced, it will be necessary to replace the suction accumulator/drier.

^ A/C evaporator core: add 90 ml (3 oz).

NOTE: Whenever an A/C condenser core is replaced, it will be necessary to replace the suction accumulator/drier.

^ A/C condenser core: add 30 ml (1 oz).

^ Suction accumulator/drier: Drill a 12.7 mm (1/2 inch) hole in the suction accumulator/drier body and drain the oil from the suction accumulator/drier through that hole. Drain the existing oil from the new suction accumulator/drier then add the same amount of oil removed, plus 60 ml (2 oz) of clean refrigerant oil to the new suction accumulator/drier.

If any other component such as an A/C evaporator core orifice or a hose is replaced, no additional refrigerant oil is necessary unless a hose bursts with a fully-charged system. Then, the addition of 60 ml (2 oz) of refrigerant oil may be necessary with the amount to be determined by the technician. The suction accumulator/drier should also be replaced under these circumstances.

CAUTION: Do not add R-12 refrigerant to an A/C system that requires the use of R-134a refrigerant. Do not add R-134a refrigerant to an A/C system that requires the use of R-12 refrigerant. These two types of refrigerant should never be mixed. Doing so may cause damage to the A/C system.