Description

Description

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)

Inspection

Inspection

If a compressor is malfunctioning (internal noise, insufficient cooling), check the compressor oil.

1. COMPRESSOR OIL JUDGMENT

   1. 1. Remove the compressor. Refer to Removal and Installation.

      2. 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

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

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

Oil Adjusting Procedure for Compressor Replacement

Before connecting recovery/recycling equipment to Nissan Sentra vehicle, check recovery/recycling equipment gauges. No refrigerant pressure should be displayed. If NG, recover refrigerant from equipment lines.

Connect recovery/recycling equipment to Nissan Sentra vehicle. Confirm refrigerant purity in supply tank using recovery/recycling equipment and refrigerant identifier. If NG, refer to Precautions For Refrigerant System Service.

Confirm refrigerant purity in Nissan Sentra vehicle A/C system using recovery/recycling equipment and refrigerant identifier. If NG, refer to Precautions For Refrigerant System Service.

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.