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Nissan Pathfinder (2008 year). Manual - part 425

PRECAUTIONS

HA-3

< PRECAUTION >

PRECAUTION

PRECAUTIONS

Precaution for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT BELT
PRE-TENSIONER"

INFOID:0000000001675578

The Supplemental Restraint System such as “AIR BAG” and “SEAT BELT PRE-TENSIONER”, used along
with a front seat belt, helps to reduce the risk or severity of injury to the driver and front passenger for certain
types of collision. This system includes seat belt switch inputs and dual stage front air bag modules. The SRS
system uses the seat belt switches to determine the front air bag deployment, and may only deploy one front
air bag, depending on the severity of a collision and whether the front occupants are belted or unbelted.
Information necessary to service the system safely is included in the SR and SB section of this Service Man-
ual.

WARNING:

• To avoid rendering the SRS inoperative, which could increase the risk of personal injury or death in

the event of a collision which would result in air bag inflation, all maintenance must be performed by
an authorized NISSAN/INFINITI dealer.

• Improper maintenance, including incorrect removal and installation of the SRS, can lead to personal

injury caused by unintentional activation of the system. For removal of Spiral Cable and Air Bag
Module, see the SR section.

• Do not use electrical test equipment on any circuit related to the SRS unless instructed to in this

Service Manual. SRS wiring harnesses can be identified by yellow and/or orange harnesses or har-
ness connectors.

Precaution for Working with HFC-134a (R-134a)

INFOID:0000000001675579

WARNING:

• CFC-12 (R-12) refrigerant and HFC-134a (R-134a) refrigerant are not compatible. If the refrigerants

are mixed compressor failure is likely to occur. Refer

HA-3, "Contaminated Refrigerant"

. To deter-

mine the purity of HFC-134a (R-134a) in the vehicle and recovery tank, use refrigerant recovery/recy-
cling equipment and refrigerant identifier.

• Use only specified oil for the HFC-134a (R-134a) A/C system and HFC-134a (R-134a) components. If

oil other than that specified is used, compressor failure is likely to occur.

• The specified HFC-134a (R-134a) oil rapidly absorbs moisture from the atmosphere. The following

handling precautions must be observed:

- When removing refrigerant components from a vehicle, immediately cap (seal) the component to

minimize the entry of moisture from the atmosphere.

- When installing refrigerant components to a vehicle, do not remove the caps (unseal) until just

before connecting the components. Connect all refrigerant loop components as quickly as possible
to minimize the entry of moisture into system.

- Only use the specified oil from a sealed container. Immediately reseal containers of oil. Without

proper sealing, oil will become moisture saturated and should not be used.

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

Remove HFC-134a (R-134a) from the A/C system using certified service equipment meeting require-
ments of SAE J2210 [HFC-134a (R-134a) recycling equipment], or SAE J2209 [HFC-134a (R-134a)
recovery equipment]. If accidental system discharge occurs, ventilate work area before resuming
service. Additional health and safety information may be obtained from refrigerant and oil manufac-
turers.

- Do not allow the refrigerant oil to come in contact with styrofoam parts. Damage may result.

Contaminated Refrigerant

INFOID:0000000001675580

If a refrigerant other than pure HFC-134a (R-134a) is identified in a vehicle, your options are:
• Explain to the customer that environmental regulations prohibit the release of contaminated refrigerant into

the atmosphere.

• Explain that recovery of the contaminated refrigerant could damage your service equipment and refrigerant

supply.

• Suggest the customer return the vehicle to the location of previous service where the contamination may

have occurred.

HA-4

< PRECAUTION >

PRECAUTIONS

• If you choose to perform the repair, recover the refrigerant using only dedicated equipment and contain-

ers. Do not recover contaminated refrigerant into your existing service equipment. If your facility does
not have dedicated recovery equipment, you may contact a local refrigerant product retailer for available ser-
vice. This refrigerant must be disposed of in accordance with all federal and local regulations. In addition,
replacement of all refrigerant system components on the vehicle is recommended.

• If the vehicle is within the warranty period, the air conditioner warranty is void. Please contact NISSAN Cus-

tomer Affairs for further assistance.

General Refrigerant Precaution

INFOID:0000000001675581

WARNING:

• Do not release refrigerant into the air. Use approved recovery/recycling equipment to capture the

refrigerant every time an air conditioning system is discharged.

• Always wear eye and hand protection (goggles and gloves) when working with any refrigerant or air

conditioning system.

• Do not store or heat refrigerant containers above 52

C (125

F).

• Do not heat a refrigerant container with an open flame; if container warming is required, place the

bottom of the container in a warm pail of water.

• Do not intentionally drop, puncture, or incinerate refrigerant containers.
• Keep refrigerant away from open flames: poisonous gas will be produced if refrigerant burns.
• Refrigerant will displace oxygen, therefore be certain to work in well ventilated areas to prevent suf-

focation.

• Do not pressure test or leak test HFC-134a (R-134a) service equipment and/or vehicle air condition-

ing systems with compressed air during repair. Some mixtures of air and HFC-134a (R-134a) have
been shown to be combustible at elevated pressures. These mixtures, if ignited, may cause injury or
property damage. Additional health and safety information may be obtained from refrigerant manu-
facturers.

Precaution for Leak Detection Dye

INFOID:0000000001675582

• The A/C system contains a fluorescent leak detection dye used for locating refrigerant leaks. An ultraviolet

(UV) lamp is required to illuminate the dye when inspecting for leaks.

• Always wear fluorescence enhancing UV safety goggles to protect your eyes and enhance the visibility of

the fluorescent dye.

• The fluorescent dye leak detector is not a replacement for an electronic refrigerant leak detector. The fluo-

rescent dye leak detector should be used in conjunction with an electronic refrigerant leak detector (J-
41995).

• For your safety and the customer's satisfaction, read and follow all manufacturer's operating instructions and

precautions prior to performing work.

• A compressor shaft seal should not be repaired because of dye seepage. The compressor shaft seal should

only be repaired after confirming the leak with an electronic refrigerant leak detector (J-41995).

• Always remove any remaining dye from the leak area after repairs are complete to avoid a misdiagnosis dur-

ing a future service.

• Do not allow dye to come into contact with painted body panels or interior components. If dye is spilled,

clean immediately with the approved dye cleaner. Fluorescent dye left on a surface for an extended period of
time cannot be removed.

• Do not spray the fluorescent dye cleaning agent on hot surfaces (engine exhaust manifold, etc.).
• Do not use more than one refrigerant dye bottle (1/4 ounce / 7.4 cc) per A/C system.
• Leak detection dyes for HFC-134a (R-134a) and CFC-12 (R-12) A/C systems are different. Do not use HFC-

134a (R-134a) leak detection dye in CFC-12 (R-12) A/C systems or CFC-12 (R-12) leak detection dye in
HFC-134a (R-134a) A/C systems or A/C system damage may result.

• The fluorescent properties of the dye will remain for over three (3) years unless a compressor failure occurs.

A/C Identification Label

INFOID:0000000001675583

Vehicles with factory installed fluorescent dye have this identification label on the underside of hood.

Precaution for Refrigerant Connection

INFOID:0000000001675584

A new type refrigerant connection has been introduced to all refrigerant lines except the following locations.
• Expansion valve to cooling unit
• Evaporator pipes to evaporator (inside cooling unit)

PRECAUTIONS

HA-5

< PRECAUTION >

• Refrigerant pressure sensor

FEATURES OF NEW TYPE REFRIGERANT CONNECTION

• The O-ring has been relocated. It has also been provided with a groove for proper installation. This reduces

the possibility of the O-ring being caught in, or damaged by, the mating part. The sealing direction of the O-
ring is now set vertically in relation to the contacting surface of the mating part to improve sealing character-
istics.

• The reaction force of the O-ring will not occur in the direction that causes the joint to pull out, thereby facili-

tating piping connections.

O-RING AND REFRIGERANT CONNECTION

SHA815E

HA-6

< PRECAUTION >

PRECAUTIONS

Front A/C Compressor and Condenser - VK56DE

AWIIA0570GB

High-pressure service valve

Clip

Front high-pressure A/C pipe

Refrigerant pressure sensor

Condenser

Compressor shaft seal

Front high-pressure flexible A/C hose

Front low-pressure flexible A/C hose

Low-pressure service valve

10. Front low-pressure A/C pipe

11.

Front expansion valve

12. Front A/C drain hose

Refrigerant leak checking order (a - k)

Tightening torque

Wrench size

O-ring size

Former type refrigerant connection

New type refrigerant connection

PRECAUTIONS

HA-7

< PRECAUTION >

Front A/C Compressor and Condenser - VQ40DE

WJIA1399E

High-pressure service valve

Clip

Front high-pressure A/C pipe

Refrigerant pressure sensor

Condenser

Compressor shaft seal

Front high-pressure flexible A/C hose

Front low-pressure flexible A/C hose

Low-pressure service valve

10. Front low-pressure A/C pipe

11.

Front expansion valve

12. Front A/C drain hose

HA-8

< PRECAUTION >

PRECAUTIONS

Rear A/C

CAUTION:

The new and former refrigerant connections use different O-ring configurations. Do not confuse O-
rings since they are not interchangeable. If a wrong O-ring is installed, refrigerant will leak at or
around the connection.

O-Ring Part Numbers and Specifications

WJIA1400E

Rear high- and low-pressure A/C pipes

Rear heater core hoses

Underfloor rear high- and low-pres-
sure A/C and heater core pipes

Rear expansion valve

PRECAUTIONS

HA-9

< PRECAUTION >

*: Always check with the Parts Department for the latest parts information.

WARNING:

Make sure all refrigerant is discharged into the recycling equipment and the pressure in the system is
less than atmospheric pressure. Then gradually loosen the discharge side hose fitting and remove it.

CAUTION:

When replacing or cleaning refrigerant cycle components, observe the following.
• When the compressor is removed, store it in the same position as it is when mounted on the car.

Failure to do so will cause oil to enter the low pressure chamber.

• When connecting tubes, always use a torque wrench and a back-up wrench.
• After disconnecting tubes, immediately plug all openings to prevent entry of dirt and moisture.
• When installing an air conditioner in the vehicle, connect the pipes as the final stage of the opera-

tion. Do not remove the seal caps of pipes and other components until just before required for con-
nection.

• Allow components stored in cool areas to warm to working area temperature before removing seal

caps. This prevents condensation from forming inside A/C components.

• Thoroughly remove moisture from the refrigeration system before charging the refrigerant.
• Always replace used O-rings.
• When connecting tube, apply oil to circle of the O-rings shown in illustration. Be careful not to apply

oil to threaded portion.
Oil name: NISSAN A/C System Oil Type S or equivalent.

• O-ring must be closely attached to dented portion of tube.
• When replacing the O-ring, be careful not to damage O-ring and tube.
• Connect tube until you hear it click, then tighten the nut or bolt by hand until snug. Make sure that

the O-ring is installed to tube correctly.

• After connecting line, conduct leak test and make sure that there is no leakage from connections.

When the refrigerant leaking point is found, disconnect that line and replace the O-ring. Then tighten
connections of seal seat to the specified torque.

Connec-
tion type

O-ring

size

Part number*

mm (in)

New

92471 N8210

6.8 (0.268)

1.85 (0.0728)

Former

J2476 89956

9.25 (0.3642)

1.78 (0.0701)

New

92472 N8210

10.9 (0.429)

2.43 (0.0957)

Former

92475 71L00

11.0 (0.433)

2.4 (0.094)

New

92473 N8210

13.6 (0.535)

2.43 (0.0957)

Former

92475 72L00

14.3 (0.563)

2.3 (0.091)

New

92474 N8210

16.5 (0.650)

2.43 (0.0957)

Former

92477 N8200

17.12 (0.6740)

1.78 (0.0701)

New

92195 AH300

21.8 (0.858)

2.4 (0.094)

SHA814E

HA-10

< PRECAUTION >

PRECAUTIONS

Precaution for Service of Compressor

INFOID:0000000001675585

• Plug all openings to prevent moisture and foreign matter from entering.
• When the compressor is removed, store it in the same position as it is when mounted on the car.
• When replacing or repairing compressor, follow “Maintenance of Oil Quantity in Compressor”

exactly. Refer to

HA-27, "Maintenance of Oil Quantity in Compressor"

• Keep friction surfaces between clutch and pulley clean. If the surface is contaminated with oil, wipe

it off by using a clean waste cloth moistened with thinner.

• After compressor service operation, turn the compressor shaft by hand more than 5 turns in both

directions. This will equally distribute oil inside the compressor. After the compressor is installed,
let the engine idle and operate the compressor for 1 hour.

• After replacing the compressor magnet clutch, apply voltage to the new one and check for normal

operation. Refer to

HA-41, "Removal and Installation for Compressor Clutch"

Precaution for Service Equipment

INFOID:0000000001675586

RECOVERY/RECYCLING EQUIPMENT

Follow the manufacturer's instructions for machine operation and machine maintenance. Never introduce any
refrigerant other than that specified into the machine.

ELECTRONIC LEAK DETECTOR

Follow the manufacturer's instructions for tester operation and tester maintenance.

VACUUM PUMP

Plug

O-ring

Torque wrench

Apply oil

Do not apply oil to thread

No good

Good

WJIA1994E

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