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Nissan Pathfinder. Manual - part 678

REFRIGERANT

HA-23

< PERIODIC MAINTENANCE >

• Air flow: VENT (ventilation)

• Intake door position: Recirculation

• Temperature setting: Full cold

• Fan (blower) speed: Maximum speed set

7. Run the engine at approximately 1,500 rpm for 2 minutes or more.
8. Stop the engine. Check again for refrigerant leakage. Go to step 4.

WARNING:

Be careful not to get burned when the engine is hot.

NOTE:

• Start refrigerant leakage check immediately after the engine is

stopped.

• When refrigerant circulation is stopped, pressure on the low-

pressure side rises gradually, and after this, pressure on the

high-pressure side falls gradually.

• The higher the pressure is, the easier it is to find the refriger-

ant leakage.

Recycle Refrigerant

INFOID:0000000009176731

WARNING:

• Always use HFC-134a for A/C refrigerant. If CFC-12 is accidentally charged, compressor is damaged

due to insufficient lubrication.

• Always observe and follow precautions described on refrigerant container. Incorrect handling may

result in an explosion of refrigerant container, frostbite or the loss of eyesight.

• Do not breathe A/C refrigerant and oil vapor or mist. Exposure may irritate eyes, nose, or throat.

• Do not allow HFC-134a to be exposed to an open flame or others because it generates poisonous

gas when in contact with high temperature objects. Keep workshop well ventilated.

1. Perform oil return operation. Refer to

HA-25, "Perform Oil Return Operation"

. (If refrigerant or oil leakage

is detected in a large amount, omit this step, and go to step 2.)

CAUTION:

Do not perform oil return operation if a large amount of refrigerant or oil leakage is detected.

2. Check gauge pressure readings of recovery/recycling/recharging equipment. When remaining pressure

exists, recycle refrigerant from high-pressure hose and low-pressure hose.

NOTE:

Follow manufacturer instructions for the handling or maintenance of the equipment. Do not fill the equip-

ment with non-specified refrigerant.

3. Remove A/C service valve cap from the vehicle.
4. Connect recovery/recycling/recharging equipment to A/C service valve.
5. Operate recovery/recycling/recharging equipment, and recycle refrigerant from the vehicle.
6. Evacuate air for 10 minutes or more to remove any remaining refrigerant integrated to compressor oil, etc.
7. Refrigerant recycle operation is complete.

Charge Refrigerant

INFOID:0000000009176732

WARNING:

• Always use HFC-134a for A/C refrigerant. If CFC-12 is accidentally charged, compressor is damaged

due to insufficient lubrication.

• Always observe and follow precautions described on refrigerant container. Incorrect handling may

result in an explosion of refrigerant container, frostbite, or the loss of eyesight.

• Do not breathe A/C refrigerant and oil vapor or mist. Exposure my irritate eyes, nose, or throat.

• Do not allow HFC-134a to be exposed to an open flame or others because it generates poisonous

gas when in contact with high temperature objects. Keep workshop well ventilated.

1. Connect recovery/recycling/recharging equipment to the A/C service valve.

SHA839E

HA-24

< PERIODIC MAINTENANCE >

REFRIGERANT

2. Operate recovery/recycling/recharging equipment, and evacuate air from A/C system for 25 minutes or

more.

CAUTION:

Evacuate air for 15 minutes or more if the parts are replaced.

3. Check the airtightness of A/C system for 25 minutes or more. If pressure raises more than the specified

level, charge A/C system with approximately 200g refrigerant and check that there is no refrigerant leak-

age. Refer to

HA-21, "Leak Test"

CAUTION:

Check the airtightness for 15 minutes or more if the parts are replaced.

4. If parts other than compressor are replaced, fill compressor oil according to parts that are replaced.
5. Charge the specified amount of refrigerant to A/C system.
6. Check that A/C system operates normally.
7. Disconnect recovery/recycling/recharging equipment. (Collect the refrigerant from the high-pressure hose

and low-pressure hose of recovery/recycling/recharging equipment.)

8. Install A/C service valve cap.
9. Refrigerant charge is complete.

OIL

HA-25

< PERIODIC MAINTENANCE >

OIL

Description

INFOID:0000000009176733

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 or otherwise the following conditions may occur:

• Insufficient oil amount: Stuck compressor

• Excessive oil amount: Insufficient cooling (caused by insufficient heat exchange)

Inspection

INFOID:0000000009176734

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

COMPRESSOR OIL JUDGMENT

1. Remove the compressor. Refer to

HA-30, "COMPRESSOR : 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 condenser (includes liquid tank).

Perform Oil Return Operation

INFOID:0000000009176735

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

INFOID:0000000009176736

Fill with oil for the amount that is calculated according to the following conditions.
Example: Oil amount to be added when replacing evaporator [m (US fl oz, Imp fl oz)] = 75 (2.5, 2.6) +

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 (includes liquid tank)

80 (2.7, 2.8)

HA-26

< PERIODIC MAINTENANCE >

OIL

Oil Adjusting Procedure for Compressor Replacement

INFOID:0000000009176737

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

HA-4, "Precautions For Refrigerant System

Service"

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

fier. If NG, refer to

HA-4, "Precautions For Refrigerant System Service"

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.

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.

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

Conditions

Oil amount to be added to A/C system

m (US fl oz, Imp fl oz)

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

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

ALIIA0759ZZ

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