Nissan Maxima. Manual — part 701

HA-30

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OIL

OIL

Description

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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 impor-

tant 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

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

1.

COMPRESSOR OIL JUDGMENT

1. Remove the compressor. Refer to

HA-37, "Removal and Installation for Compressor"

.

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

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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 (blower) 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

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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) +

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Oil Type

: A/C System Oil Type S

JSIIA0927GB

Conditions

Oil amount to be added to A/C system

m (US fl oz, Imp fl oz)

Replace evaporator

75 (2.5, 2.6)

Replace condenser

75 (2.5, 2.6)

OIL

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Oil Adjusting Procedure for Compressor Replacement

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1. 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.

2. 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)"

.

3. Confirm refrigerant purity in vehicle A/C system using recovery/recycling equipment and refrigerant identi-

fier. If NG, refer to

HAC-92, "Working with HFC-134a (R-134a)"

.

4. Discharge refrigerant into the refrigerant recovery/recycling equipment. Measure oil discharged into the

recovery/recycling equipment.

5. Drain the oil from the “old” (removed) compressor into a graduated container and recover the amount of

oil drained.

Replace liquid tank

5 (0.2, 0.2)

Refrigerant leakage is detected

Large amount leakage

30 (1.0, 1.1)

Small amount leakage

—

Oil amount that is recycled together with refrigerant during recycle operation

α

Conditions

Oil amount to be added to A/C system

m (US fl oz, Imp fl oz)

1.

New compressor

2.

Old compressor

3.

Recovery/recycling equipment

4.

Measuring cup X

5.

Measuring cup Y

6.

New oil

A.

Drain oil from the new compressor
into clean container

B.

Record amount of oil recovered

C.

Add an additional 5 m (0.2 US fl oz,
0.2 Imp fl oz) of new oil when replacing
liquid tank

D.

Install new oil equal to recorded
amounts in measuring cups X plus Y

WJIA1716E

HA-32

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OIL

6. Drain the oil from the “new” compressor into a separate, clean container.
7. 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.

8. Measure an amount of new oil equal to the amount recovered during discharging. Add this oil to “new”

compressor through the suction port opening.

9. 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.

REFRIGERATION SYSTEM

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REFRIGERATION SYSTEM

Inspection

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1.

CHECK BLOWER MOTOR OPERATION

Check blower motor operation. Refer to

HAC-53, "Component Function Check"

.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair or replace the parts according to the inspection results.

2.

CHECK COMPRESSOR OPERATION

Check compressor operation. Refer to

HAC-57, "Component Function Check"

.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair or replace the parts according to the inspection results.

3.

CHECK REFRIGERANT CYCLE PRESSURE

Connect recovery/recycling recharging equipment to the vehicle and perform the diagnosis with the gauge

pressure. Refer to

HA-19, "WITH COLOR DISPLAY : Trouble Diagnoses for Abnormal Pressure"

(with color

display) or

HA-22, "WITH MONOCHROME DISPLAY : Trouble Diagnoses for Abnormal Pressure"

(with

monochrome display).
Is the inspection result normal?

YES

>> Perform the performance test. Refer to

HAC-84, "Performance Chart"

.

NO

>> Repair or replace the parts according to the inspection results.

Performance Chart

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TEST CONDITION

Testing must be performed as follows:

TEST READING

Recirculating-to-discharge Air Temperature Table

Vehicle location

Indoors or in the shade (in a well-ventilated place)

Doors

Closed

Door windows

Open

Hood

Open

TEMP.

Max. COLD

Mode switch

(Ventilation) set

Intake switch

(Recirculation) set

(fan) speed

Max. speed set

Engine speed

Idle speed

Operate the air conditioning system for 10 minutes before taking measurements.

Inside air (Recirculating air) at blower assembly inlet

Discharge air temperature at center ventilator

°C (°F)

Relative humidity

%

Air temperature

°C (°F)

50 - 60

25 (77)

10.0 - 12.3 (50 - 54)

30 (86)

13.2 - 15.3 (56 - 60)

35 (95)

17.2 - 21.0 (63 - 70)