Maintenance of Oil Quantity in Compressor
The oil in the compressor circulates through the system with the refrigerant. Add oil to compressor when replacing any component or after a large refrigerant leakage has occurred. It is important to maintain the specified amount.
If oil quantity is not maintained properly, the following malfunctions may result:
Lack of oil: May lead to a seized compressor
Excessive oil: Inadequate cooling (thermal exchange interference)
Oil type: NISSAN A/C System Oil Type S or equivalent
CHECKING AND ADJUSTING
If excessive oil leakage is noted, do not perform the oil return operation.
Start the engine and set the following conditions:
Engine speed: Idling to 1,200 rpm
A/C switch: On
Blower fan speed: Max. position
Temperature control: Optional [Set so that intake air temperature is 25° to 30° C (77° to 86°F).]
Intake position: Recirculation ( )
Perform oil return operation for about ten minutes Adjust the oil quantity according to the following table.
Oil Adjusting Procedure for Components Replacement Except Compressor
After replacing any of the following major components, add the correct amount of oil to the system.
Oil Adjustment Procedure for Compressor Replacement
Before connecting recovery/recycling equipment to vehicle, check recovery/recycling equipment gauges. No refrigerant pressure should be displayed. If NG, recover refrigerant from equipment lines.
Connect recovery/recycling equipment to vehicle. Confirm refrigerant purity in supply tank using recovery/recycling equipment and refrigerant identifier. If NG, refer to See: Service Precautions\Technician Safety Information\Contaminated Refrigerant.
Confirm refrigerant purity in vehicle A/C system using recovery/recycling equipment and refrigerant identifier. If NG, refer to See: Service Precautions\Technician Safety Information\Contaminated Refrigerant.
Discharge refrigerant into the refrigerant recovery/recycling equipment. Measure oil discharged into the recovery/recycling equipment.
Drain the oil from the "old" (removed) compressor into a graduated container and recover the amount of oil drained.
Drain the oil from the "new" compressor into a separate, clean container.
Measure an amount of new oil installed equal to amount drained from "old" compressor. Add this oil to "new" compressor through the suction port opening.
Measure an amount of new oil equal to the amount recovered during discharging. Add this oil to "new" compressor through the suction port opening.
If the liquid tank also needs to be replaced, add an additional 5 ml (0.2 US fl oz, 0.2 Imp fl oz) of oil at this time.
Do not add the 5 ml (0.2 US fl oz, 0.2 Imp fl oz) of oil if only replacing the compressor and not the liquid tank.