Nissan Versa (N17): Oil

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)

TYPE : Refer to HA "Oil".

Inspection

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

1.COMPRESSOR OIL JUDGMENT

1. Remove the compressor. Refer to HA "Removal and Installation".
2. Sample compressor oil and judge based on 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.

    1.   Start the engine and set to the following conditions.

• Engine speed: Idling to 1,200 rpm
• A/C switch: ON
• Fan speed: Maximum speed set
• Intake door position: Recirculation
• Temperature setting: Full cold

2. Perform oil return operation for approximately 10 minutes.
3. Stop the engine.
4. 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 (Imp fl oz.)] = 35 (1.2) + 5 (0.2) + α       

Oil Adjusting Procedure for Compressor Replacement

1.   Drain oil from removed compressor and measure oil amount.

1. Drain oil from high-pressure port (A) and low-pressure port (B) while rotating magnet clutch.

 

2. Measure total amount of oil that is drained from removed compressor.

2.   Drain oil from a new compressor that is calculated according to the following conditions;

Amount to be drained (A) [m (Imp fl oz.)] = F − (D + S + R + α)

F : Oil amount that a new compressor contains [120 (4.2)]

D : Oil amount that is drained from removed compressor

S : Oil amount that remains inside of removed compressor [20 (0.7)]

R : Oil amount to be added according to components that are removed except compressor

α : Oil amount that is recycled together with refrigerant during recycle operation

CAUTION: If oil amount that is drained from removed compressor is less than 60 m (2.1 Imp fl oz.), perform calculation by setting "D" as 40 m (1.4 Imp fl oz.).               

Example: oil amount to be drained from a new compressor when replacing compressor and liquid tank [m (Imp fl oz.)] [D = 60 (2.1), α = 5 (0.2)] 120 (4.2) − [60 (2.1) + 20 (0.7) + 5 (0.2) + 5 (0.2)] = 30 (1.1)

3.   Install compressor and check the operation.