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VENTILATION, HEATER & AIR CONDITIONER

HEATER & AIR CONDITIONING SYSTEM
SECTION HA B

E
CONTENTS
BASIC INSPECTION ................................... 3
. BOTH HIGH- AND LOW-PRESSURE SIDES ARE F
TOO LOW .................................................................12
.
DIAGNOSIS AND REPAIR WORKFLOW ......... 3
. BOTH HIGH- AND LOW-PRESSURE SIDES
Work Flow ................................................................ 3
. ARE TOO LOW : Symptom Table ..........................12 . G
FUNCTION DIAGNOSIS .............................. 4
. LOW-PRESSURE SIDE SOMETIMES BECOMES
NEGATIVE ................................................................13
.
REFRIGERATION SYSTEM .............................. 4
. LOW-PRESSURE SIDE SOMETIMES BE- H
System Diagram ....................................................... 4
. COMES NEGATIVE : Symptom Table ...................13 .
System Description .................................................. 4
.
Component Parts Location ....................................... 5
. LOW-PRESSURE SIDE BECOMES NEGATIVE .....14 .
HA
Component Description ............................................ 7
. LOW-PRESSURE SIDE BECOMES NEGATIVE :
Symptom Table ......................................................14
.
VARIABLE DISPLACEMENT COMPRESSOR
SYSTEM ............................................................. 8
. PRECAUTION ............................................. 15
. J
System Diagram ....................................................... 8
.
System Description .................................................. 8
.
PRECAUTIONS ................................................. 15
Precaution for Supplemental Restraint System
K
SYMPTOM DIAGNOSIS ............................. 11
. (SRS) "AIR BAG" and "SEAT BELT PRE-TEN-
SIONER" ................................................................15
.
REFRIGERATION SYSTEM SYMPTOMS ........11
. Precaution Necessary for Steering Wheel Rota-
tion after Battery Disconnect ..................................15 . L
SYMPTOM DIAGNOSIS PROCEDURE ................... 11 . Precaution for Procedure without Cowl Top Cover 15 ....
SYMPTOM DIAGNOSIS PROCEDURE : Trouble Precautions For Xenon Headlamp Service ............16 .
Diagnosis For Unusual Pressure ........................... 11
. Working with HFC-134a (R-134a) ..........................16 . M
BOTH HIGH- AND LOW-PRESSURE SIDES ARE General Refrigerant Precaution ..............................17 .
TOO HIGH ................................................................ 11
. Refrigerant Connection ...........................................17.
BOTH HIGH- AND LOW-PRESSURE SIDES Service Equipment .................................................21
.
N
ARE TOO HIGH : Symptom Table ......................... 11 . COMPRESSOR ................................................. 24
HIGH-PRESSURE SIDE IS TOO HIGH AND LOW- General Precautions ...............................................24
.
PRESSURE SIDE IS TOO LOW .............................. 11 . O
LEAK DETECTION DYE ................................... 25
HIGH-PRESSURE SIDE IS TOO HIGH AND
General Precautions ...............................................25
.
LOW-PRESSURE SIDE IS TOO LOW : Symptom
Table ...................................................................... 11
. PREPARATION .......................................... 26
. P
HIGH-PRESSURE SIDE IS TOO LOW AND LOW- PREPARATION ................................................. 26
PRESSURE SIDE IS TOO HIGH .............................. 12 .
Special Service Tool ...............................................26
.
HIGH-PRESSURE SIDE IS TOO LOW AND Commercial Service Tool .......................................28
.
LOW-PRESSURE SIDE IS TOO HIGH : Symptom
Sealant or/and Lubricant ........................................29
.
Table ...................................................................... 12
.
ON-VEHICLE MAINTENANCE ................... 30
.

Revision: October 2006 HA-1 2007 G35 Sedan
LUBRICANT ..................................................... 30
. LOW-PRESSURE PIPE 1 AND HIGH-PRES-
Adjustment ............................................................. 30
. SURE PIPE 2 .................................................... 51
.
Exploded View ....................................................... 51
.
REFRIGERATION SYSTEM ............................. 32
. Removal and Installation ........................................ 51
.
Inspection .............................................................. 32
.
Performance Chart ................................................ 33 . CONDENSER ................................................... 53
.
Refrigerant Leaks .................................................. 34
. Exploded View ....................................................... 53
.
Removal and Installation ........................................ 53
.
FLUORESCENT LEAK DETECTOR ................ 36
.
Inspection .............................................................. 36
. CONDENSER PIPE ASSEMBLY ..................... 54
.
Exploded View ....................................................... 54
.
ELECTRICAL LEAK DETECTOR .................... 37
. Removal and Installation ........................................ 54
.
Inspection .............................................................. 37
.
LIQUID TANK ................................................... 56
.
ON-VEHICLE REPAIR ............................... 40
. Exploded View ....................................................... 56
.
Removal and Installation ........................................ 56
.
REFRIGERATION SYSTEM ............................. 40
.
Exploded View ....................................................... 40
. REFRIGERANT PRESSURE SENSOR ........... 57
.
Inspection After Installation ................................... 40
. Exploded View ....................................................... 57
.
Removal and Installation ........................................ 57
.
COMPRESSOR ................................................ 43
.
Exploded View ....................................................... 43
. EVAPORATOR ................................................. 58
.
Removal and Installation ....................................... 43 . Exploded View ....................................................... 58
.
Inspection .............................................................. 44
. Removal and Installation ........................................ 58
.
LOW-PRESSURE FLEXIBLE HOSE AND EXPANSION VALVE ........................................ 60
.
PIPE 2 ............................................................... 45
. Exploded View ....................................................... 60
.
Exploded View ....................................................... 45
. Removal and Installation ........................................ 60
.
Removal and Installation ....................................... 45
.
SERVICE DATA AND SPECIFICATIONS
HIGH-PRESSURE FLEXIBLE HOSE ............... 47
. (SDS) .......................................................... 62
Exploded View ....................................................... 47
.
Removal and Installation ....................................... 47
. SERVICE DATA AND SPECIFICATIONS
(SDS) ................................................................ 62
.
HIGH-PRESSURE PIPE 1(ENGINE COM-
Compressor ........................................................... 62
.
PARTMENT) ..................................................... 49
. Lubricant ................................................................ 62
.
Exploded View ....................................................... 49
. Refrigerant ............................................................. 62
.
Removal and Installation ....................................... 49
. Engine Idling Speed ............................................... 62 .
Belt Tension ........................................................... 62
.

Revision: October 2006 HA-2 2007 G35 Sedan
DIAGNOSIS AND REPAIR WORKFLOW
< BASIC INSPECTION >
BASIC INSPECTION A
DIAGNOSIS AND REPAIR WORKFLOW
Work Flow INFOID:0000000000959834
B

DETAILED FLOW
1.LISTEN TO CUSTOMER COMPLAINT C
Listen to customer complaint. (Get detailed information about the conditions and environment when the symp-
tom occurs.)
D
>> GO TO 2.
2.VERIFY THE SYMPTOM WITH OPERATIONAL CHECK E
Verify the symptom with operational check. Refer to HAC-5, "WITHOUT LEFT AND RIGHT VENTILATION
TEMPERATURE SEPARATELY CONTROL SYSTEM : Description & Inspection" (Without left and right venti-
lation temperature separately control system) or HAC-9, "WITH LEFT AND RIGHT VENTILATION TEMPERA- F
TURE SEPARATELY CONTROL SYSTEM : Description & Inspection" (With left and right ventilation
temperature separately control system).
G
>> GO TO 3.
3.GO TO APPROPRIATE TROUBLE DIAGNOSIS
H
Go to appropriate trouble diagnosis (Refer to HAC-117, "Diagnosis Chart By Symptom" below).

>> GO TO 4.
HA
4.REPAIR OR REPLACE
Repair or replace the specific parts
J
>> GO TO 5.
5.FINAL CHECK K
Final check.
Is the inspection result normal?
YES >> CHECK OUT L

Revision: October 2006 HA-3 2007 G35 Sedan
REFRIGERATION SYSTEM
< FUNCTION DIAGNOSIS >
FUNCTION DIAGNOSIS
REFRIGERATION SYSTEM
System Diagram INFOID:0000000000959835

RJIA1552E

System Description INFOID:0000000000959836

REFRIGERANT CYCLE
Refrigerant Flow
The refrigerant flows from the compressor, through the condenser with liquid tank, through the evaporator, and
back to the compressor. The refrigerant evaporation in the evaporator is controlled by an externally equalized
expansion valve, located inside the evaporator case.
Freeze Protection
To prevent evaporator frozen up, the evaporator air temperature is monitored, and the voltage signal to the
display and A/C auto amp. will make the A/C relay go OFF and stop the compressor.
REFRIGERANT SYSTEM PROTECTION
Refrigerant Pressure Sensor
The refrigerant system is protected against excessively high- or low-pressures by the refrigerant pressure sen-
sor, located on the condenser. If the system pressure rises above, or falls below the specifications, the refrig-
erant pressure sensor detects the pressure inside the refrigerant line and sends the voltage signal to the ECM.
ECM makes the A/C relay go OFF and stops the compressor when pressure on the high-pressure side
detected by refrigerant pressure sensor is over about 3,119 kPa (31.8 kg/cm2, 452 psi), or below about 118
kPa (1.2 kg/cm2, 17 psi).
Pressure Relief Valve
The refrigerant system is also protected by a pressure relief valve, located in the rear head of the compressor.
When the pressure of refrigerant in the system increases to an unusual level [more than 3,628 kPa (37 kg/
cm2, 526 psi)], the release port on the pressure relief valve automatically opens and releases refrigerant into
the atmosphere.
LUBRICANT

Revision: October 2006 HA-4 2007 G35 Sedan
REFRIGERATION SYSTEM
< FUNCTION DIAGNOSIS >
Maintenance of Lubricant Quantity in Compressor
The lubricant in the compressor circulates through the system with the refrigerant. Add lubricant to compres- A
sor when replacing any component or after a large refrigerant leakage occurred. It is important to maintain the
specified amount.
If lubricant quantity is not maintained properly, the following malfunctions may result:
B

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