Infiniti QX56 (Z62). Manual - part 765

 

  Index      Infiniti     Infiniti QX56 (Z62) - service repair manual 2011 year

 

Search            

 

 

 

 

 

 

 

 

 

Content   ..  763  764  765  766   ..

 

 

Infiniti QX56 (Z62). Manual - part 765

 

 

HA-1

VENTILATION, HEATER & AIR CONDITIONER

C

D

E

F

G

H

J

K

L

M

SECTION 

HA

A

B

HA

N

O

P

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 Procedure without Cowl Top Cover 

......

4

Precautions For Refrigerant System Service  ............

4

Service Equipment  ....................................................

6

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

9

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

9

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

9

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

12

Sealant or/and Lubricant  .........................................

12

SYSTEM DESCRIPTION  .............................

13

COMPONENT PARTS  .......................................

13

Component Parts Location ......................................

13

Component Description ...........................................

13

SYSTEM .............................................................

14

System Diagram ......................................................

14

System Description  .................................................

14

BASIC INSPECTION  ...................................

16

DIAGNOSIS AND REPAIR WORKFLOW  .........

16

Work Flow  ...............................................................

16

REFRIGERANT ..................................................

18

Description ..............................................................

18

Leak Test  ................................................................

18

Recycle Refrigerant .................................................

20

Charge Refrigerant ..................................................

20

LUBRICANT .......................................................

22

Description ..............................................................

22

Inspection ................................................................

22

Perform Lubricant Return Operation  .......................

22

Lubricant Adjusting Procedure for Components 
Replacement Except Compressor ...........................

22

Lubricant Adjusting Procedure for Compressor 
Replacement ...........................................................

23

PERFORMANCE TEST  ....................................

25

Inspection ................................................................

25

SYMPTOM DIAGNOSIS  ..............................

27

REFRIGERATION SYSTEM SYMPTOMS ........

27

Trouble Diagnosis For Unusual Pressure ................

27

Symptom Table  .......................................................

27

NOISE ................................................................

29

Symptom Table  .......................................................

29

REMOVAL AND INSTALLATION  ...............

30

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

30

Exploded View .........................................................

30

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

30

COMPRESSOR : Removal and Installation ............

30

MAGNET CLUTCH  ....................................................

31

MAGNET CLUTCH : Removal and Installation of 
Compressor Clutch ..................................................

31

Inspection ................................................................

32

COOLER PIPE AND HOSE  ..............................

33

Exploded View .........................................................

33

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

34

HIGH-PRESSURE FLEXIBLE HOSE : Removal 
and Installation  ........................................................

34

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

35

LOW-PRESSURE FLEXIBLE HOSE : Removal 
and Installation  ........................................................

35

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

35

HA-2

HIGH-PRESSURE PIPE : Removal and Installa-
tion .........................................................................
.

35

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

36

LOW-PRESSURE PIPE : Removal and Installa-
tion .........................................................................
.

36

REAR COOLER PIPE  ...............................................

37

REAR COOLER PIPE : Removal and Installation ...

37

CONDENSER ....................................................

38

Exploded View  ........................................................

38

CONDENSER ............................................................

38

CONDENSER : Removal and Installation  ..............

38

LIQUID TANK ............................................................

39

LIQUID TANK : Removal and Installation ...............

39

REFRIGERANT PRESSURE SENSOR ....................

39

REFRIGERANT PRESSURE SENSOR : Remov-
al and Installation ...................................................
.

39

A/C UNIT ASSEMBLY .......................................

41

Exploded View  ........................................................

41

HEATER & COOLING UNIT ASSEMBLY  ................

42

HEATER & COOLING UNIT ASSEMBLY : Re-
moval and Installation  ............................................
.

42

EVAPORATOR .........................................................

43

EVAPORATOR : Removal and Installation  ............

43

HEATER CORE .........................................................

44

HEATER CORE : Removal and Installation  ...........

44

EXPANSION VALVE  .................................................

44

EXPANSION VALVE : Removal and Installation  ....

44

REAR A/C UNIT  ................................................

46

Exploded View  ........................................................

46

REAR A/C UNIT ASSEMBLY  ...................................

47

REAR A/C UNIT ASSEMBLY : Removal and In-
stallation ..................................................................

47

EVAPORATOR ..........................................................

48

EVAPORATOR : Removal and Installation .............

48

EVAPORATOR PIPE ASSEMBLY  ...........................

48

EVAPORATOR PIPE ASSEMBLY : Removal and 
Installation ...............................................................

48

HEATER CORE  .........................................................

48

HEATER CORE : Removal and Installation ............

48

EXPANSION VALVE  .................................................

49

EXPANSION VALVE : Removal and Installation  ....

49

SERVICE DATA AND SPECIFICATIONS 
(SDS) ..........................................................

50

SERVICE DATA AND SPECIFICATIONS 
(SDS) .................................................................

50

Compressor ............................................................

50

Lubricant .................................................................

50

Refrigerant ..............................................................

50

Engine Idling Speed ................................................

50

Belt Tension  ............................................................

50

PRECAUTIONS

HA-3

< PRECAUTION >

C

D

E

F

G

H

J

K

L

M

A

B

HA

N

O

P

PRECAUTION

PRECAUTIONS

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

INFOID:0000000006276136

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 “SRS AIR BAG” and “SEAT BELT” of this
Service Manual.

WARNING:

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

the event of a collision that 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 “SRS AIR BAG”.

• 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 Air Bag Diagnosis Sensor Unit or other Air Bag System sensors with the

ignition 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:0000000006276137

NOTE:
• Before removing and installing any control units, first turn the push-button ignition switch to the LOCK posi-

tion, then disconnect both battery cables.

• After finishing work, confirm that all control unit connectors are connected properly, then re-connect both

battery cables.

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

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

For vehicle with steering lock unit, if the battery is disconnected or discharged, the steering wheel will lock and
cannot be turned.
If turning the steering wheel is required with the battery disconnected or discharged, follow the operation pro-
cedure below before starting the repair operation.

OPERATION PROCEDURE

1.

Connect both battery cables.
NOTE:
Supply power using jumper cables if battery is discharged.

2.

Turn the push-button ignition switch to ACC position.
(At this time, the steering lock will be released.)

3.

Disconnect both battery cables. The steering lock will remain released with both battery cables discon-
nected and the steering wheel can be turned.

4.

Perform the necessary repair operation.

HA-4

< PRECAUTION >

PRECAUTIONS

5.

When the repair work is completed, re-connect both battery cables. With the brake pedal released, turn
the push-button ignition switch from ACC position to ON position, then to LOCK position. (The steering
wheel will lock when the push-button ignition switch is turned to LOCK position.)

6.

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

Precaution for Procedure without Cowl Top Cover

INFOID:0000000006276138

When performing the procedure after removing cowl top cover, cover
the lower end of windshield with urethane, etc.

Precautions For Refrigerant System Service

INFOID:0000000006276139

GENERAL REFRIGERANT PRECAUTION

WARNING:

• Never breathe A/C refrigerant and lubricant vapor or mist. Exposure may irritate eyes, nose and

throat. Use only approved recovery/recycling equipment to discharge HFC-134a (R-134a) refrigerant.
Ventilate work area before resuming service if accidental system discharge occurs. Additional health
and safety information may be obtained from refrigerant and lubricant manufacturers.

• Never release refrigerant into the air. Use approved recovery/recycling recharging equipment to cap-

ture the refrigerant each time an air conditioning system is discharged.

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

conditioning system.

• Never store or heat refrigerant containers above 52

°

C (126

°

F).

• Never heat a refrigerant container with an open flame; Place the bottom of the container in a warm

pail of water if container warming is required.

• Never intentionally drop, puncture, or incinerate refrigerant containers.
• Keep refrigerant away from open flames: poisonous gas is produced if refrigerant burns.
• Refrigerant displaces oxygen, therefore be certain to work in well ventilated areas to prevent suffo-

cation.

• Never pressure test or leakage test HFC-134a (R-134a) service equipment and/or vehicle air condi-

tioning 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 refriger-
ant manufacturers.

WORKING WITH HFC-134a (R-134a)

CAUTION:

• CFC-12 (R-12) refrigerant and HFC-134a (R-134a) refrigerant are not compatible. These regrigerants

must never be mixed, even in the smallest amounts. Compressor malfunction is likely occur if the
refrigerants are mixed.

• Use only specified lubricant for the HFC-134a (R-134a) A/C system and HFC-134a (R-134a) compo-

nents. Compressor malfunction is likely to occur if lubricant other than that specified is used.

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

lowing handling precautions must be observed:

- Cap (seal) immediately the component to minimize the entry of moisture from the atmosphere when

removing refrigerant components from a vehicle.

- Never remove the caps (unseal) until just before connecting the components when installing refrig-

erant components to a vehicle. Connect all refrigerant loop components as quickly as possible to
minimize the entry of moisture into system.

- Use only the specified lubricant from a sealed container. Reseal immediately containers of lubricant.

Lubricant becomes moisture saturated and should not be used without proper sealing.

PIIB3706J

 

 

 

 

 

 

 

Content   ..  763  764  765  766   ..