Adding Refrigerant Oil

The 10P15C compressor uses a special paraffin base refrigerant oil YN-9 (E73Z-19557-A) or equivalent refrigerant oil meeting Ford Specification ESH-M2C31-A2. A total oil charge of 240ml (8 fluid oz) is used in a new system. It is important that only the specified type and quantity of refrigerant oil be used in the compressor. If there is a surplus of oil in the system, excessive oil will circulate with the refrigerant reducing the cooling capacity of the system. Too little oil will result in poor lubrication of the compressor.

When it is necessary to replace a component of the refrigerant system, the procedures in this Section must be followed to ensure that the total oil charge in the system is correct after the new part is installed. When the compressor is operated, oil gradually leaves the 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 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, it is necessary to compensate for this by adding the lost oil to the new replacement part. The procedures for replacing oil follow.

During Compressor Replacement

NOTE: The suction accumulator/drier and the orifice tube should also be replaced whenever the compressor is replaced.

A new service replacement compressor contains 240ml (8 fluid oz) of the specified refrigerant oil. Prior to installing the replacement compressor, drain the oil from the removed (old) compressor into a calibrated container. Then, drain the refrigerant oil from the new compressor into a clean calibrated container. If the amount of oil drained from the removed compressor was between 90 and 148ml (3 and 5 oz), pour the same amount of clean refrigerant oil into the new compressor. If the amount of oil that was removed from the old compressor is greater than 148ml (5 oz), pour 148ml (5 oz) of clean refrigerant oil into the new compressor. If the amount of refrigerant oil that was removed from the old compressor is less than 90ml (3 oz), pour 90ml (3 oz) of clean refrigerant oil into the new compressor.

This will maintain the system total oil charge within the specified limits.

During Component Replacement

When replacing other components of the air conditioning refrigerant 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 added to the replacement components as follows:

• Evaporator Core: Add 90ml (3 fluid oz).
• Condenser: Add 30ml (1 fluid oz).
• Accumulator: Drill a 12.7mm (1/2 inch) hole in the accumulator body and drain oil from accumulator through that hole. Add same amount of oil removed plus 60ml (two fluid oz) of clean refrigerant oil to new accumulator.

Clean refrigerant oil should be poured directly into the replacement component. If any other components, such as an orifice tube or a hose, are replaced, no additional refrigerant oil is necessary unless a hose bursts with a fully charged system. Then, the addition of 2 oz. of refrigerant oil is recommended. The suction accumulator/drier should also be replaced under these circumstances.