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VENTILATION, HEATER & AIR CONDITIONER

HEATER & AIR CONDITIONING SYSTEM
SECTION HA B

E
CONTENTS
BASIC INSPECTION ................................... 3
. COMPRESSOR ................................................. 19 F
General Precautions ...............................................19
.
DIAGNOSIS AND REPAIR WORK FLOW ........ 3
.
Work Flow ................................................................ 3
. LEAK DETECTION DYE ................................... 20 G
General Precautions ...............................................20
.
FUNCTION DIAGNOSIS .............................. 5
.
PREPARATION .......................................... 21
.
REFRIGERATION SYSTEM .............................. 5
. H
System Diagram ....................................................... 5
. PREPARATION ................................................. 21
System Description .................................................. 5
. Special Service Tool ...............................................21
.
Component Parts Location ....................................... 6
. Commercial Service Tool .......................................23
. HA
Component Description ............................................ 7
. Sealant or/and Lubricant ........................................23
.

SYMPTOM DIAGNOSIS .............................. 8
. ON-VEHICLE MAINTENANCE ................... 25
.
J
REFRIGERATION SYSTEM SYMPTOMS ......... 8
. LUBRICANT ...................................................... 25
Trouble Diagnosis For Unusual Pressure ................ 8 . Maintenance of Lubricant Quantity .........................25 .
Symptom Table ........................................................ 8
. Lubricant Adjusting Procedure for Components
K
Replacement Except Compressor ..........................25 .
COMPRESSOR SYSTEM SYMPTOMS ............11
. Lubricant Adjusting Procedure for Compressor
Symptom Table ...................................................... 11
. Replacement ..........................................................26
.
L
PRECAUTION ............................................. 12
. REFRIGERATION SYSTEM ............................. 28
Inspection ...............................................................28
.
PRECAUTIONS .................................................12
. Performance Chart .................................................28 . M
FOR USA AND CANADA ......................................... 12
. Refrigerant Leakages .............................................29 .
FOR USA AND CANADA : Precaution for Supple- FLUORESCENT LEAK DETECTOR ................ 30
mental Restraint System (SRS) "AIR BAG" and N
Inspection ...............................................................30
.
"SEAT BELT PRE-TENSIONER" ........................... 12
.
ELECTRICAL LEAK DETECTOR .................... 31
FOR MEXICO ........................................................... 12
.
Inspection ...............................................................31
.
FOR MEXICO : Precaution for Supplemental Re- O
straint System (SRS) "AIR BAG" and "SEAT BELT ON-VEHICLE REPAIR ................................ 34
.
PRE-TENSIONER" ................................................ 12
.
Precaution Necessary for Steering Wheel Rota- REFRIGERATION SYSTEM ............................. 34 P
tion after Battery Disconnect .................................. 13
. Exploded View ........................................................34
.
Precaution for Procedure without Cowl Top Cover 13 .... Inspection After Installation ....................................34
.
Precautions For Xenon Headlamp Service ............ 13 .
Working with HFC-134a (R-134a) .......................... 14 . COMPRESSOR ................................................. 37
General Refrigerant Precaution ............................. 14 . Exploded View ........................................................37
.
Refrigerant Connection .......................................... 15
. Removal and Installation ........................................37 .
Service Equipment ................................................. 17
. Inspection ...............................................................38
.

Revision: 2008 October HA-1 2009 Murano
LOW-PRESSURE FLEXIBLE HOSE ............... 39
. REFRIGERANT PRESSURE SENSOR ........... 53
.
Exploded View ....................................................... 39
. Exploded View ....................................................... 53
.
Removal and Installation ....................................... 39
. Removal and Installation ........................................ 53
.

HIGH-PRESSURE FLEXIBLE HOSE ............... 41
. EVAPORATOR PIPE ASSEMBLY ................... 54
.
Exploded View ....................................................... 41
. Exploded View ....................................................... 54
.
Removal and Installation ....................................... 41
. Removal and Installation ........................................ 54
.

LOW-PRESSURE PIPE .................................... 43
. EVAPORATOR ................................................. 57
.
Exploded View ....................................................... 43
. Exploded View ....................................................... 57
.
Removal and Installation ....................................... 43
. Removal and Installation ........................................ 58
.

HIGH-PRESSURE PIPE ................................... 45
. EXPANSION VALVE ........................................ 59
.
Exploded View ....................................................... 45
. Exploded View ....................................................... 59
.
Removal and Installation ....................................... 45
. Removal and Installation ........................................ 60
.

CONDENSER PIPE ASSEMBLY ..................... 47
. SERVICE DATA AND SPECIFICATIONS
Exploded View ....................................................... 47
. (SDS) .......................................................... 61
Removal and Installation ....................................... 47
.
SERVICE DATA AND SPECIFICATIONS
CONDENSER ................................................... 49
. (SDS) ................................................................ 61
.
Exploded View ....................................................... 49
. Compressor ........................................................... 61
.
Removal and Installation ....................................... 49
. Lubricant ................................................................ 61
.
LIQUID TANK ................................................... 51
. Refrigerant ............................................................. 61
.
Engine Idling Speed ............................................... 61 .
Exploded View ....................................................... 51
.
Belt Tension ........................................................... 61
.
Removal and Installation ....................................... 51
.

Revision: 2008 October HA-2 2009 Murano
DIAGNOSIS AND REPAIR WORK FLOW
< BASIC INSPECTION >
BASIC INSPECTION A
DIAGNOSIS AND REPAIR WORK FLOW
Work Flow INFOID:0000000003341421
B

OVERALL SEQUENCE
C

JSIIA0943GB M
*1: Refer to HAC-103, "DTC Index" (WITHOUT 7 INCH DISPLAY) or HAC-220, "DTC Index" (WITH 7 INCH
DISPLAY).
*2: Refer to HAC-105, "Diagnosis Chart By Symptom" (WITHOUT 7 INCH DISPLAY) or HAC-222, "Diagnosis
N
Chart By Symptom" (WITH 7 INCH DISPLAY).
DETAILED FLOW
1.OBTAIN INFORMATION ABOUT SYMPTOM O

Interview the customer to obtain as much information as possible about the conditions and environment under
which the malfunction occurred.
P

>> GO TO 2.
2.VERIFY SYMPTOM
Verify the symptom with operational check based on the information obtained from the customer. Refer to
HAC-126, "Description & Inspection" (WITHOUT 7 INCH DISPLAY) or HAC-222, "Diagnosis Chart By Symp-
tom" (WITH 7 INCH DISPLAY).

Revision: 2008 October HA-3 2009 Murano
DIAGNOSIS AND REPAIR WORK FLOW
< BASIC INSPECTION >

>> GO TO 3.
3.CHECK WITH SELF-DIAGNOSIS FUNCTION OF CONSULT-III
Using CONSULT-III, perform "SELF-DIAGNOSIS RESULTS" of HVAC. Refer to HAC-103, "DTC Index"
(WITHOUT 7 INCH DISPLAY) or HAC-220, "DTC Index" (WITH 7 INCH DISPLAY).
Are self-diagnosis results normal?
YES >> GO TO 4.
NO >> GO TO 5.
4.NARROW DOWN THE MALFUNCTIONING PARTS BY SYMPTOM DIAGNOSIS
Perform symptom diagnosis and narrow down the malfunctioning parts. Refer to HAC-105, "Diagnosis Chart
By Symptom" (WITHOUT 7 INCH DISPLAY) or HAC-222, "Diagnosis Chart By Symptom" (WITH 7 INCH DIS-
PLAY).

>> GO TO 5.
5.REPAIR OR REPLACE
Repair or replace malfunctioning parts.
NOTE:
If DTC is displayed, erase DTC after repairing or replacing malfunctioning parts.

>> GO TO 6.
6.FINAL CHECK
Check that the A/C system operates normally.
Is the inspection result normal?
YES >> INSPECTION END
NO >> GO TO 3.

Revision: 2008 October HA-4 2009 Murano
REFRIGERATION SYSTEM
< FUNCTION DIAGNOSIS >
FUNCTION DIAGNOSIS A
REFRIGERATION SYSTEM
System Diagram INFOID:0000000003072948
B

HA
RJIA1552E

J
System Description INFOID:0000000003072949

REFRIGERANT CYCLE
K
Refrigerant Flow
The refrigerant flows from the compressor, through the condenser with a liquid tank, through the evaporator,
and then back to the compressor. The refrigerant evaporation in the evaporator is controlled by an externally L
equalized expansion valve, located at dash panels.
Freeze Protection
To prevent the evaporator from freezing up, the evaporator air temperature is monitored, and the voltage sig- M
nal to the A/C auto amp. turns the A/C relay OFF and stops the compressor.
REFRIGERANT SYSTEM PROTECTION
Refrigerant Pressure Sensor N
The refrigerant system is protected against excessively high or low-pressures by the refrigerant pressure sen-
sor, located on the liquid tank. The refrigerant pressure sensor detects the pressure inside the refrigerant line
and sends the voltage signal to the ECM if the system pressure rises above, or falls below the specifications. O
ECM turns the A/C relay OFF and stops the compressor when pressure on the high-pressure side detected by
the refrigerant pressure sensor is over approximately 3,119 kPa (31.8 kg/cm2, 452 psi) or below approximately
118 kPa (1.2 kg/cm2, 17 psi). P
Pressure Relief Valve
The refrigerant system is also protected by a pressure relief valve, located in the rear head of the compressor.
The release port on the pressure relief valve automatically opens and releases refrigerant into the atmosphere
when the pressure of the refrigerant in the system increases to an unusual level [more than 3,600 kPa (36.7
kg/cm2, 522 psi)].

Revision: 2008 October HA-5 2009 Murano
REFRIGERATION SYSTEM
< FUNCTION DIAGNOSIS >
Component Parts Location INFOID:0000000003072950

JPIIA0550ZZ

1. Compressor 2. Condenser 3. Liquid tank
4. Refrigerant pressure sensor

Revision: 2008 October HA-6 2009 Murano
REFRIGERATION SYSTEM
< FUNCTION DIAGNOSIS >

JPIIA0551ZZ
K

1. Evaporator 2. Expansion valve 3. Blower motor
L
Component Description INFOID:0000000003072951

M
Component Description
Compressor Intakes, compresses, and discharges refrigerant, to circulate refrigerant inside the refrigerant cycle.
Condenser Cools refrigerant discharged from compressor, and transforms it to liquid refrigerant. N
Liquid tank Eliminates foreign material in refrigerant, and temporarily stores liquid refrigerant.
Refrigerant pressure sensor Refer to EC-463, "Description".
The mist form liquid refrigerant transforms to gas through evaporation by the air conveyed from the O
Evaporator
blower motor. The air is cooled by the heat from evaporation.
Transforms high-pressure liquid refrigerant to mist form from low-pressure liquid refrigerant by the
Expansion valve
drawing function. P
Takes in air from the vehicle or fresh outside air, provides it forcedly pushes it into to the air condi-
Blower motor
tioner, and circulates it inside the vehicle.

Revision: 2008 October HA-7 2009 Murano
REFRIGERATION SYSTEM SYMPTOMS
< SYMPTOM DIAGNOSIS >
SYMPTOM DIAGNOSIS
REFRIGERATION SYSTEM SYMPTOMS
Trouble Diagnosis For Unusual Pressure INFOID:0000000003072952

Diagnose using a manifold gauge whenever the system's high and/or low side pressure(s) is/are unusual. The
marker above the gauge scale in the following tables indicates the standard pressure range. Refer to the
above table (Ambient air temperature-to-operating pressure table) since the standard pressure, however, dif-
fers from vehicle to vehicle.
Symptom Table INFOID:0000000003072953

Gauge indication Refrigerant cycle Probable cause Corrective action
The pressure returns to nor-
mal and is reduced soon after Excessive refrigerant charge in Reduce refrigerant until speci-
water is splashed on con- refrigeration cycle. fied pressure is obtained.
denser.
Insufficient condenser cooling
performance.

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