Infiniti QX56 (JA60). Manual - part 574

 

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Infiniti QX56 (JA60). Manual - part 574

 

 

HA-1

VENTILATION, HEATER & AIR CONDITIONER

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SECTION 

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CONTENTS

HEATER & AIR CONDITIONING SYSTEM

PRECAUTION ...............................................

3

PRECAUTIONS ...................................................

3

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

3

Precaution Necessary for Steering Wheel Rota-
tion After Battery Disconnect .....................................

3

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

4

Precaution for Procedure without Cowl Top Cover 

......

4

Contaminated Refrigerant  .........................................

4

General Refrigerant Precaution  ................................

5

Precaution for Leak Detection Dye  ...........................

5

A/C Identification Label  .............................................

5

Precaution for Refrigerant Connection ......................

5

Precaution for Service of Compressor  ....................

10

Precaution for Service Equipment ...........................

10

PREPARATION ...........................................

13

PREPARATION ..................................................

13

Special Service Tool  ...............................................

13

HFC-134a (R-134a) Service Tool and Equipment ....

13

Commercial Service Tool  ........................................

16

FUNCTION DIAGNOSIS ..............................

17

REFRIGERATION SYSTEM  ..............................

17

Refrigerant Cycle  ....................................................

17

Refrigerant System Protection ................................

17

OIL ......................................................................

19

Maintenance of Oil in Compressor ..........................

19

ON-VEHICLE MAINTENANCE ....................

20

REFRIGERATION SYSTEM  ..............................

20

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

20

OIL ......................................................................

22

Maintenance of Oil Quantity in Compressor  ...........

22

FLUORESCENT LEAK DETECTOR  ................

24

Checking of Refrigerant Leaks ................................

24

Checking System for Leaks Using the Fluorescent 
Dye Leak Detector ...................................................

24

Dye Injection ............................................................

24

ELECTRICAL LEAK DETECTOR  ....................

26

Checking of Refrigerant Leaks ................................

26

Electronic Refrigerant Leak Detector .......................

26

ON-VEHICLE REPAIR .................................

29

REFRIGERATION SYSTEM  .............................

29

Component ..............................................................

29

COMPRESSOR .................................................

31

Removal and Installation for Compressor  ...............

31

Removal and Installation for Compressor Clutch ....

32

LOW-PRESSURE FLEXIBLE HOSE ................

36

Removal and Installation for Low-Pressure Flexi-
ble Hose  ..................................................................

36

LOW-PRESSURE PIPE  ....................................

37

Removal and Installation for Low-Pressure Pipe .....

37

Removal and Installation for Rear High- and Low-
Pressure A/C and Heater Core Pipes ......................

37

Removal and Installation for Underfloor Rear 
High- and Low-Pressure A/C and Heater Core 
Pipes ........................................................................

38

HIGH-PRESSURE FLEXIBLE HOSE  ...............

40

Removal and Installation for High-Pressure Flexi-
ble Hose  ..................................................................

40

HIGH-PRESSURE PIPE ....................................

41

Removal and Installation for High-Pressure Pipe ....

41

Removal and Installation for Rear High- and Low-
Pressure A/C and Heater Core Pipes ......................

41

Removal and Installation for Underfloor Rear 
High- and Low-Pressure A/C and Heater Core 
Pipes ........................................................................

42

PRECAUTIONS

HA-3

< PRECAUTION >

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PRECAUTION

PRECAUTIONS

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

INFOID:0000000005403104

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.

PRECAUTIONS WHEN USING POWER TOOLS (AIR OR ELECTRIC) AND HAMMERS

WARNING:

• When working near the Airbag Diagnosis Sensor Unit or other Airbag System sensors with the Igni-

tion ON or engine running, DO NOT use air or electric power tools or strike near the sensor(s) with a

hammer. Heavy vibration could activate the sensor(s) and deploy the air bag(s), possibly causing

serious injury.

• When using air or electric power tools or hammers, always switch the Ignition OFF, disconnect the

battery, and wait at least 3 minutes before performing any service.

Precaution Necessary for Steering Wheel Rotation After Battery Disconnect

INFOID:0000000005403105

NOTE:

• This Procedure is applied only to models with Intelligent Key system and NATS (NISSAN ANTI-THEFT SYS-

TEM).

• Remove and install all control units after disconnecting both battery cables with the ignition knob in the

″LOCK″ position.

• Always use CONSULT-III to perform self-diagnosis as a part of each function inspection after finishing work.

If DTC is detected, perform trouble diagnosis according to self-diagnostic results.

For models equipped with the Intelligent Key system and NATS, an electrically controlled steering lock mech-

anism is adopted on the key cylinder.

For this reason, if the battery is disconnected or if the battery is discharged, the steering wheel will lock and

steering wheel rotation will become impossible.

If steering wheel rotation is required when battery power is interrupted, follow the procedure below before

starting the repair operation.

OPERATION PROCEDURE

1. Connect both battery cables.

NOTE:

Supply power using jumper cables if battery is discharged.

2. Use the Intelligent Key or mechanical key to turn the ignition switch to the 

″ACC″ position. At this time, the

steering lock will be released.

3. Disconnect both battery cables. The steering lock will remain released and the steering wheel can be

rotated.

4. Perform the necessary repair operation.

HA-4

< PRECAUTION >

PRECAUTIONS

5. When the repair work is completed, return the ignition switch to the 

″LOCK″ position before connecting

the battery cables. (At this time, the steering lock mechanism will engage.)

6. Perform a self-diagnosis check of all control units using CONSULT-III. 

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

INFOID:0000000005147630

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 to 

HA-4, "Contaminated Refrigerant"

. To deter-

mine the purity of HFC-134a (R-134a) in the vehicle and recovery tank, use recovery/recycling  equip-

ment 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 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 manufacturers.

- Do not allow A/C oil to come in contact with styrofoam parts. Damage may result.

Precaution for Procedure without Cowl Top Cover

INFOID:0000000005147631

When performing the procedure after removing cowl top cover, cover

the lower end of windshield with urethane, etc.

Contaminated Refrigerant

INFOID:0000000005147632

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.

• 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.

PIIB3706J

 

 

 

 

 

 

 

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