Nissan Maxima Service and Repair Manual: Oil
MAINTENANCE OF OIL LEVEL
The compressor oil is circulating in the system together with the refrigerant. It is necessary to fill compressor with oil when replacing A/C system parts or when a large amount of refrigerant leakage is detected. It is important to always maintain oil level within the specified level, otherwise the following conditions may occur:
- Insufficient oil amount: Stuck compressor
- Excessive oil amount: Insufficient cooling (caused by insufficient heat exchange)
Oil Type : A/C System Oil Type S
If a compressor is malfunctioning (internal noise, insufficient cooling), check the compressor oil.
1.COMPRESSOR OIL JUDGMENT
- Remove the compressor. Refer to HA-37, "Removal and Installation for Compressor".
- Sample compressor oil and judge below according to the figure.
Judgement result 1>>Replace compressor only.
Judgement result 2>>Replace compressor and liquid tank.
Perform Oil Return Operation
CAUTION: If a large amount of refrigerant or oil leakage is detected, do not perform oil return operation.
- Start the engine and set to the following conditions:
- Engine speed: Idling to 1,200 rpm
- A/C switch: ON
- Fan (blower) speed: Maximum speed set
- Intake door position: Recirculation
- Temperature setting: Full cold
- Perform oil return operation for approximately 10 minutes.
- Stop the engine.
- Oil return operation is complete.
Oil Adjusting Procedure for Components Replacement Except Compressor
Fill with oil for the amount that is calculated according to the following conditions.
Example: Oil amount to be added when replacing evaporator and liquid tank [m (US fl oz, Imp fl oz)] = 45 (1.5, 1.6) + 15 (0.5, 0.5) + α
Oil Adjusting Procedure for Compressor Replacement
- New compressor
- Old compressor
- Recovery/recycling equipment
- Measuring cup X
- Measuring cup Y
- New oil
- Drain oil from the new compressor into clean container
- Record amount of oil recovered
- Add an additional 5 m (0.2 US fl oz, 0.2 Imp fl oz) of new oil when replacing liquid tank
- Install new oil equal to recorded amounts in measuring cups X plus Y
- 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 HAC-92, "Working with HFC-134a (R-134a)"
- Confirm refrigerant purity in vehicle A/C system using
recovery/recycling equipment and refrigerant identifier.
If NG, refer to HAC-92, "Working with HFC-134a (R-134a)".
- 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 m (0.2 US fl oz, 0.2 Imp fl oz) of oil at this time.
CAUTION: Do not add the 5 m (0.2 US fl oz, 0.2 Imp fl oz) of oil if only replacing the compressor and not the liquid tank.