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Nissan Pathfinder (2011 year). Manual - part 438

REFRIGERATION SYSTEM

HA-25

< PERIODIC MAINTENANCE >

PERIODIC MAINTENANCE

REFRIGERATION SYSTEM

HFC-134a (R-134a) Service Procedure

INFOID:0000000006243589

SETTING OF SERVICE TOOLS AND EQUIPMENT

Discharging Refrigerant

WARNING:

Avoid breathing A/C refrigerant and oil vapor or mist. Exposure may irritate eyes, nose and throat.

Remove HFC-134a (R-134a) refrigerant from the A/C system using certified service equipment meeting

requirements of SAE J2210 HFC-134a (R-134a) recycling equipment or SAE J2201 HFC-134a (R-134a)

recovery equipment. If an accidental system discharge occurs, ventilate the work area before resum-

ing service. Additional health and safety information may be obtained from the refrigerant and oil man-

ufacturers.

Evacuating System and Charging Refrigerant

Shut-off valve

A/C service valve

Recovery/recycling equipment

WJIA1160E

WJIA1161E

2011 Pathfinder

HA-26

< PERIODIC MAINTENANCE >

REFRIGERATION SYSTEM

Shut-off valve

A/C service valve

Recovery/recycling equipment

Refrigerant container (HFC-134a)

Refrigerant weight scale (J-39699)

Vacuum pump (J-39649)

Manifold gauge set with hoses and
couplers (J-39183-C)

HA-27, "Maintenance of Oil Quantity

in Compressor"

HA-29, "Checking of Refrigerant
Leaks"

HA-4, "Contaminated Refrigerant"

HA-29, "Checking of Refrigerant
Leaks"

HAC-21, "CONSULT-III Function
(HVAC)"

WJIA1923E

2011 Pathfinder

OIL

HA-27

< PERIODIC MAINTENANCE >

OIL

Maintenance of Oil Quantity in Compressor

INFOID:0000000006243590

CHECKING AND ADJUSTING

CAUTION:

If excessive oil leakage is noted, do not perform the oil return operation.

Start the engine and set the following conditions:

Test Conditions

•

Engine speed: idling to 1,200 rpm

•

A/C switch: ON

•

Blower fan speed: HIGH

•

Temperature control: optional [set so intake air temperature is 25

to 30

C (77

to 86

F)]

•

Intake position: RECIRCULATION mode

•

Perform oil return operation for about ten minutes

Adjust the oil quantity according to the following table.

Oil Adjusting Procedure for Components Replacement Except Compressor

After replacing any of the following major components, add the correct amount of oil to the system.

Amount of Oil to be Added

*1: If refrigerant leak is small, no addition of oil is needed.

Oil Adjustment Procedure for Compressor Replacement

Part replaced

Oil to be added to system

Remarks

Amount of oil

m (US fl oz, Imp fl oz)

Front evaporator

75 (2.5, 2.6)

—

Rear evaporator

75 (2.5, 2.6)

—

Condenser

75 (2.5, 2.6)

—

Liquid tank

5 (0.2, 0.2)

Add if compressor is not replaced.

In case of refrigerant leak

30 (1.0, 1.1)

Large leak

—

Small leak *1

2011 Pathfinder

HA-28

< PERIODIC MAINTENANCE >

OIL

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, "Contaminated Refrigerant"

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

fier. If NG, refer to

HA-4, "Contaminated Refrigerant"

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.

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.

Do not add this 5 m (0.2 US fl oz, 0.2 Imp fl oz) of oil if only replacing the compressor.

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

WJIA1716E

2011 Pathfinder

FLUORESCENT LEAK DETECTOR

HA-29

< PERIODIC MAINTENANCE >

FLUORESCENT LEAK DETECTOR

Checking of Refrigerant Leaks

INFOID:0000000006243591

PRELIMINARY CHECK

Perform a visual inspection of all refrigeration parts, fittings, hoses and components for signs of A/C oil leak-

age, damage, and corrosion. Any A/C oil leakage may indicate an area of refrigerant leakage. Allow extra

inspection time in these areas when using either an electronic refrigerant leak detector (J-41995) or fluores-

cent dye leak detector (J-42220).

If any dye is observed using a fluorescent dye leak detector (J-42220), confirm the leak using a electronic

refrigerant leak detector (J-41995). It is possible that the dye is from a prior leak that was repaired and not

properly cleaned.

When searching for leaks, do not stop when one leak is found but continue to check for additional leaks at all

system components and connections.

When searching for refrigerant leaks using an electronic refrigerant leak detector (J-41995), move the probe

along the suspected leak area at 25 - 50 mm (1 - 2 in) per second and no further than 6 mm (1/4 in) from the

component.

CAUTION:

Moving the electronic refrigerant leak detector probe slower and closer to the suspected leak area will

improve the chances of finding a leak.

Checking System for Leaks Using the Fluorescent Dye Leak Detector

INFOID:0000000006243592

1. Check the A/C system for leaks using the fluorescent dye leak detector and safety goggles (J-42220) in a

low sunlight area (area without windows preferable). Illuminate all components, fittings and lines. The dye

will appear as a bright green/yellow area at the point of leakage. Fluorescent dye observed at the evapo-

rator drain opening indicates an evaporator core assembly leak (tubes, core or expansion valve).

2. If the suspected area is difficult to see, use an adjustable mirror or wipe the area with a clean shop rag or

cloth, then inspect the shop rag or cloth with the fluorescent dye leak detector (J-42220) for dye residue.

3. After the leak is repaired, remove any residual dye using refrigerant dye cleaner (J-43872) to prevent

future misdiagnosis.

4. Perform a system performance check and then verify the leak repair using a electronic refrigerant leak

detector (J-41995).

NOTE:

• Other gases in the work area or substances on the A/C components, for example, anti-freeze, wind-

shield washer fluid, solvents and oils, may falsely trigger the leak detector. Make sure the surfaces to be

checked are clean.

• Clean with a dry cloth or blow off with shop air.

• Do not allow the sensor tip of the electronic refrigerant leak detector (J-41995) to contact with any sub-

stance. This can also cause false readings and may damage the detector.

Dye Injection

INFOID:0000000006243593

NOTE:

This procedure is only necessary when recharging the system or when the compressor has seized and must

be replaced.
1. Check the A/C system static (at rest) pressure. Pressure must be at least 345 kPa (3.52 kg/cm

, 50 psi).

2. Pour one bottle 7.4 cc (1/4 ounce) of the HFC-134a (R-134a) fluorescent leak detection dye (J-41447) into

the HFC-134a (R-134a) dye injector (J-41459).

CAUTION:

If repairing the A/C system or replacing a component, pour the HFC-134a (R-134a) fluorescent leak

detection dye (J-41447) directly into the open system connection and proceed with the service

procedures.

3. Connect the refrigerant dye injector (J-41459) to the low-pressure service valve.
4. Start the engine and switch the A/C system ON.
5. When the A/C system is operating (compressor running), inject one bottle 7.4 cc (1/4 ounce) of HFC-134a

(R-134a) fluorescent leak detection dye (J-41447) through the low-pressure service valve using HFC-

134a (R-134a) dye injector (J-41459). Refer to the manufacturer's operating instructions.

2011 Pathfinder

HA-30

< PERIODIC MAINTENANCE >

FLUORESCENT LEAK DETECTOR

6. With the engine still running, disconnect the HFC-134a (R-134a) dye injector (J-41459) from the low-pres-

sure service valve.

7. Operate the A/C system for a minimum of 20 minutes to mix the HFC-134a (R-134a) fluorescent leak

detection dye (J-41447) with the A/C system oil. Depending on the leak size, operating conditions and

location of the leak, it may take from minutes to days for the HFC-134a (R-134a) fluorescent leak detec-

tion dye to penetrate an A/C system leak and become visible.

2011 Pathfinder

ELECTRICAL LEAK DETECTOR

HA-31

< PERIODIC MAINTENANCE >

ELECTRICAL LEAK DETECTOR

Checking of Refrigerant Leaks

INFOID:0000000006243594

PRELIMINARY CHECK

Perform a visual inspection of all refrigeration parts, fittings, hoses and components for signs of A/C oil leak-

age, damage, and corrosion. Any A/C oil leakage may indicate an area of refrigerant leakage. Allow extra

inspection time in these areas when using either an electronic refrigerant leak detector (J-41995) or fluores-

cent dye leak detector (J-42220).

If any dye is observed using a fluorescent dye leak detector (J-42220), confirm the leak using a electronic

refrigerant leak detector (J-41995). It is possible that the dye is from a prior leak that was repaired and not

properly cleaned.

When searching for leaks, do not stop when one leak is found but continue to check for additional leaks at all

system components and connections.

When searching for refrigerant leaks using an electronic refrigerant leak detector (J-41995), move the probe

along the suspected leak area at 25 - 50 mm (1 - 2 in) per second and no further than 6 mm (1/4 in) from the

component.

CAUTION:

Moving the electronic refrigerant leak detector probe slower and closer to the suspected leak area will

improve the chances of finding a leak.

Electronic Refrigerant Leak Detector

INFOID:0000000006243595

PRECAUTIONS FOR HANDLING LEAK DETECTOR

NOTE:

When performing a refrigerant leak check, use a electronic refrigerant leak detector (J-41995) or equivalent.

Ensure that the electronic refrigerant leak detector (J-41995) is calibrated and set properly according to the

manufacturer's operating instructions.

The electronic refrigerant leak detector (J-41995) is a delicate

device. To use the electronic refrigerant leak detector (J-41995)

properly, read the manufacturer's operating instructions and perform

any specified maintenance.

1. Position the probe approximately 5 mm (3/16 in) away from the

point to be checked as shown.

AHA281A

SHA707EA

2011 Pathfinder

HA-32

< PERIODIC MAINTENANCE >

ELECTRICAL LEAK DETECTOR

2. When checking for leaks, circle each fitting completely with the

probe as shown.

3. Move the probe along each component at a speed of approxi-

mately 25 - 50 mm (1 - 2 in)/second as shown.

CHECKING PROCEDURE

NOTE:

To prevent inaccurate or false readings, make sure there is no refrigerant vapor, shop chemicals, or cigarette

smoke in the vicinity of the vehicle. Perform the leak test in a calm area (low air/wind movement) so that the

leaking refrigerant is not dispersed.
1. Turn the engine OFF.
2. Connect the manifold gauge set (J-39183-C) to the A/C service ports. Refer to

HA-36, "HFC-134a (R-

134a) Service Procedure"

3. Check if the A/C refrigerant pressure is at least 345 kPa (3.52 kg/cm

, 50 psi) above a temperature of

C (61

F). If less than specification, recover/evacuate and recharge the system with the specified

amount of refrigerant. Refer to

HA-36, "HFC-134a (R-134a) Service Procedure"

NOTE:

At temperatures below 16

C (61

F), leaks may not be detected since the system may not reach 345 kPa

(3.52 kg/cm

, 50 psi) pressure.

4. Perform the leak test from the high-pressure side (front A/C compressor discharge “a” to evaporator inlet

“f” or rear piping connection “l”) to the low-pressure side (front A/C evaporator drain hose “g” to shaft seal

“k” and rear A/C evaporator drain hose “o” to piping connection “r”). Refer to

HA-34, "Component"

. Clean

the component to be checked and carefully move the electronic refrigerant leak detector probe completely

around the following connections and components.

• Check the compressor shaft seal

• Check the high and low-pressure pipe and hose fittings, relief valve, and compressor shaft seal

• Check the liquid tank

• Check the refrigerant pressure sensor

• Check all around the service valves. Check that the service valve caps are screwed tightly on the ser-

vice valves (to prevent leaks).

NOTE:

After removing manifold gauge set (J-39183-C) from the service valves, wipe any residue from the ser-

vice valves to prevent any false readings by the electronic refrigerant leak detector (J-41995).

• Evaporator

With engine OFF, turn blower fan on “High” for at least 15 seconds to dissipate any refrigerant trace in

the heater and cooling unit assembly. Wait a minimum of 10 minutes accumulation time (refer to the

manufacturer's recommended procedure for actual wait time) before inserting the electronic refrigerant

leak detector probe into the heater and cooling unit assembly drain hose.

NOTE:

SHA706E

SHA708EA

2011 Pathfinder

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