2007 NISSAN 350Z cooling

ATC-2Revision: 2006 November2007 350Z WORK FLOW ...................................................... 34
SYMPTOM TABLE .............................................. 34
Component Parts and Harness Connector Location ... 35
ENGINE COMPARTMENT .................................. 35
PASSENGER COMPARTMENT .......................... 36
Schematic ............................................................... 37
Wiring Diagram — A/C — ....................................... 38
Auto Amp. Terminals and Reference Value ............ 43
PIN CONNECTOR TERMINAL LAYOUT ............ 43
TERMINALS AND REFERENCE VALUE FOR
UNIFIED METER AND A/C AMP. ........................ 43
Self-diagnosis Function .......................................... 45
DESCRIPTION .................................................... 45
FUNCTION CONFIRMATION PROCEDURE ...... 46
AUXILIARY MECHANISM: TEMPERATURE
SETTING TRIMMER ........................................... 50
AUXILIARY MECHANISM: FOOT POSITION
SETTING TRIMMER ........................................... 51
AUXILIARY MECHANISM: INLET PORT MEM-
ORY FUNCTION ................................................. 51
Operational Check .................................................. 53
CHECKING BLOWER ......................................... 53
CHECKING DISCHARGE AIR ............................ 53
CHECKING INTAKE DOOR ................................ 53
CHECKING TEMPERATURE DECREASE ......... 53
CHECKING TEMPERATURE INCREASE .......... 53
CHECKING A/C SWITCH ................................... 53
Power Supply and Ground Circuit for Auto Amp. ... 54
INSPECTION FLOW ........................................... 54
COMPONENT DESCRIPTION ............................ 54
DIAGNOSIS PROCEDURE FOR A/C SYSTEM ... 55
LAN System Circuit ................................................ 56
DIAGNOSIS PROCEDURE FOR LAN CIRCUIT ... 56
Mode Door Motor Circuit ........................................ 60
INSPECTION FLOW ........................................... 60
SYSTEM DESCRIPTION .................................... 61
COMPONENT DESCRIPTION ............................ 62
DIAGNOSIS PROCEDURE FOR MODE DOOR
MOTOR ............................................................... 62
Air Mix Door Motor Circuit ...................................... 63
INSPECTION FLOW ........................................... 63
SYSTEM DESCRIPTION .................................... 64
COMPONENT DESCRIPTION ............................ 65
DIAGNOSIS PROCEDURE FOR AIR MIX DOOR ... 65
Air Mix Door Motor PBR Circuit .............................. 65
DIAGNOSIS PROCEDURE FOR AIR MIX DOOR
MOTOR PBR ....................................................... 65
Intake Door Motor Circuit ........................................ 66
INSPECTION FLOW ........................................... 66
SYSTEM DESCRIPTION .................................... 67
COMPONENT DESCRIPTION ............................ 68
DIAGNOSIS PROCEDURE FOR INTAKE DOOR
MOTOR ............................................................... 68
Blower Motor Circuit ............................................... 69
INSPECTION FLOW ........................................... 69
SYSTEM DESCRIPTION .................................... 70
COMPONENT DESCRIPTION ............................ 71
DIAGNOSIS PROCEDURE FOR BLOWER
MOTOR ............................................................... 71COMPONENT INSPECTION ............................... 73
Magnet Clutch Circuit .............................................. 74
INSPECTION FLOW ............................................ 74
SYSTEM DESCRIPTION ..................................... 75
DIAGNOSIS PROCEDURE FOR MAGNET
CLUTCH .............................................................. 75
COMPONENT INSPECTION ............................... 80
Insufficient Cooling .................................................. 81
INSPECTION FLOW ............................................ 81
PERFORMANCE TEST DIAGNOSIS .................. 83
PERFORMANCE CHART .................................... 85
TROUBLE DIAGNOSIS FOR UNUSUAL PRES-
SURE ................................................................... 86
Insufficient Heating ................................................. 89
INSPECTION FLOW ............................................ 89
Noise ....................................................................... 90
INSPECTION FLOW ............................................ 90
Self-diagnosis ......................................................... 91
INSPECTION FLOW ............................................ 91
Ambient Sensor Circuit ........................................... 92
COMPONENT DESCRIPTION ............................ 92
AMBIENT TEMPERATURE INPUT PROCESS ... 92
DIAGNOSIS PROCEDURE FOR AMBIENT
SENSOR .............................................................. 92
COMPONENT INSPECTION ............................... 94
In-vehicle Sensor Circuit ......................................... 94
COMPONENT DESCRIPTION ............................ 94
DIAGNOSIS PROCEDURE FOR IN-VEHICLE
SENSOR .............................................................. 95
COMPONENT INSPECTION ............................... 96
Sunload Sensor Circuit ........................................... 97
COMPONENT DESCRIPTION ............................ 97
SUNLOAD INPUT PROCESS ............................. 97
DIAGNOSIS PROCEDURE FOR SUNLOAD
SENSOR .............................................................. 97
COMPONENT INSPECTION ............................... 99
Intake Sensor Circuit .............................................100
COMPONENT DESCRIPTION ..........................100
DIAGNOSIS PROCEDURE FOR INTAKE SEN-
SOR ...................................................................100
COMPONENT INSPECTION .............................101
A/C CONTROLLER .................................................102
Removal and Installation .......................................102
REMOVAL ..........................................................102
INSTALLATION ..................................................102
Disassembly and Assembly ..................................102
AUTO AMP ..............................................................103
Removal and Installation of Unified Meter and A/C
Amp. ......................................................................103
REMOVAL ..........................................................103
INSTALLATION ..................................................103
AMBIENT SENSOR ................................................104
Removal and Installation .......................................104
REMOVAL ..........................................................104
INSTALLATION ..................................................104
IN-VEHICLE SENSOR ............................................105
Removal and Installation .......................................105
REMOVAL ..........................................................105
INSTALLATION ..................................................105

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Revision: 2006 November2007 350Z SUNLOAD SENSOR .............................................. 106
Removal and Installation ...................................... 106
REMOVAL ......................................................... 106
INSTALLATION ................................................. 106
INTAKE SENSOR ................................................... 107
Removal and Installation ...................................... 107
REMOVAL ......................................................... 107
INSTALLATION ................................................. 107
BLOWER UNIT ....................................................... 108
Removal and Installation ...................................... 108
REMOVAL ......................................................... 108
INSTALLATION ................................................. 108
Disassembly and Assembly ................................. 109
BLOWER MOTOR ...................................................110
Removal and Installation ....................................... 110
REMOVAL .......................................................... 110
INSTALLATION .................................................. 110
INTAKE DOOR MOTOR .......................................... 111
Removal and Installation ...................................... . 111
REMOVAL ......................................................... . 111
INSTALLATION ................................................. . 111
HEATER & COOLING UNIT ASSEMBLY ...............112
Removal and Installation ....................................... 112
REMOVAL .......................................................... 112
INSTALLATION .................................................. 113
Disassembly and Assembly .................................. 114
MODE DOOR MOTOR ............................................116
Removal and Installation ....................................... 116
REMOVAL .......................................................... 116
INSTALLATION .................................................. 116
AIR MIX DOOR MOTOR ..........................................117
Removal and Installation ....................................... 117
REMOVAL .......................................................... 117
INSTALLATION .................................................. 117
HEATER CORE .......................................................118
Removal and Installation ....................................... 118
REMOVAL .......................................................... 118
INSTALLATION .................................................. 118
DUCTS AND GRILLES ...........................................119
Removal and Installation ....................................... 119
COMPONENT LAYOUT ..................................... 119
REMOVAL .......................................................... 119
INSTALLATION ................................................. 122
REFRIGERANT LINES ........................................... 123
HFC-134a (R-134a) Service Procedure ............... 123
SETTING OF SERVICE TOOLS AND EQUIP-
MENT ................................................................ 123
Components ......................................................... 125
Removal and Installation of Compressor ............. 125REMOVAL .........................................................125
INSTALLATION .................................................126
Check Disc to Pulley Clearance ...........................126
Removal and Installation of Low-pressure Flexible
Hose and Pipe 2 ...................................................127
REMOVAL .........................................................127
INSTALLATION .................................................128
Removal and Installation of High-pressure Flexible
Hose .....................................................................128
REMOVAL .........................................................128
INSTALLATION .................................................129
Removal and Installation of High-pressure Pipe 1
(Engine Compartment) .........................................130
REMOVAL .........................................................130
INSTALLATION .................................................130
Removal and Installation of Low-pressure Pipe 1
and High-pressure Pipe 2 .....................................131
REMOVAL .........................................................131
INSTALLATION .................................................132
Removal and Installation of Liquid Tank ...............132
REMOVAL .........................................................132
INSTALLATION .................................................133
Removal and Installation of Condenser ................133
REMOVAL .........................................................133
INSTALLATION .................................................134
Removal and Installation of Refrigerant Pressure
Sensor ..................................................................135
REMOVAL .........................................................135
INSTALLATION .................................................135
Removal and Installation of Evaporator ................135
REMOVAL .........................................................135
INSTALLATION .................................................135
Removal and Installation of Expansion Valve .......137
REMOVAL .........................................................137
INSTALLATION .................................................137
Checking for Refrigerant Leaks ............................138
Checking System for Leaks Using the Fluorescent
Leak Detector .......................................................138
Dye Injection .........................................................138
Electrical Leak Detector ........................................139
PRECAUTIONS FOR HANDLING LEAK
DETECTOR .......................................................139
CHECKING PROCEDURE ...............................140
SERVICE DATA AND SPECIFICATIONS (SDS) ....142
Compressor ..........................................................142
Lubricant ...............................................................142
Refrigerant ............................................................142
Engine Idling Speed .............................................142
Belt Tension ..........................................................142

LUBRICANT
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Revision: 2006 November2007 350Z
LUBRICANTPFP:KLG00
Maintenance of Lubricant Quantity in CompressorNJS0000I
The lubricant in the compressor circulates through the system with the refrigerant. Add lubricant to compres-
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:

Lack of lubricant: May lead to a seized compressor.

Excessive lubricant: Inadequate cooling (thermal exchange interference)
LUBRICANT
LUBRICANT RETURN OPERATION
Adjust the lubricant quantity according to the test group shown below.
1. CHECK LUBRICANT RETURN OPERATION
Can lubricant return operation be performed?

A/C system works properly.

There is no evidence of a large amount of lubricant leakage.
CAUTION:
If excessive lubricant leakage is noted, never perform the lubricant return operation.
OK or NG
OK >> GO TO 2.
NG >> GO TO 3.
2. PERFORM LUBRICANT RETURN OPERATION, PROCEEDING AS FOLLOWS
1. Start the engine, and set to the following conditions:
–Engine speed: Idling to 1,200 rpm
–A/C switch: ON
–Blower speed: Max. position
–Temp. control: Optional [Set so that intake air temperature is 25 to 30°C (77 to 86°F).]
–Intake position: Recirculation (REC)
2. Perform lubricant return operation for about 10 minutes.
3. Stop the engine.
>> GO TO 3.
3. CHECK REPLACEMENT PART
Should the compressor be replaced?
YES >> GO TO AT C - 2 3 , "LUBRICANT ADJUSTING PROCEDURE FOR COMPRESSOR REPLACE-
MENT" .
NO >> GO TO AT C - 2 2 , "
LUBRICANT ADJUSTING PROCEDURE FOR COMPONENTS REPLACE-
MENT EXCEPT COMPRESSOR" . Name : Nissan A/C System Oil Type S

ATC-34
TROUBLE DIAGNOSIS
Revision: 2006 November2007 350Z
How to Perform Trouble Diagnosis for Quick and Accurate RepairNJS0000R
WORK FLOW
SYMPTOM TABLE
*1ATC-53, "Operational Check"
SHA900E
Symptom Reference Page
A/C system does not come on. Go to Trouble Diagnosis Procedure for A/C system.ATC-54, "
Power
Supply and
Ground Circuit for
Auto Amp."
Air outlet does not change.
Go to Trouble Diagnosis Procedure for Mode Door Motor. (LAN)ATC-60, "Mode
Door Motor Cir-
cuit"Mode door motor does not operate normally.
Discharge air temperature does not change.
Go to Trouble Diagnosis Procedure for Air Mix Door Motor. (LAN)AT C - 6 3 , "
Air Mix
Door Motor Cir-
cuit"Air mix door motor does not operate nor-
mally.
Intake door does not change.
Go to Trouble Diagnosis Procedure for Intake Door Motor. (LAN)AT C - 6 6 , "
Intake
Door Motor Cir-
cuit"Intake door motor does not operate normally.
Blower motor operation is malfunctioning. Go to Trouble Diagnosis Procedure for Blower Motor.AT C - 6 9 , "
Blower
Motor Circuit"
Magnet clutch does not engage. Go to Trouble Diagnosis Procedure for Magnet Clutch.AT C - 7 4 , "Magnet
Clutch Circuit"
Insufficient cooling Go to Trouble Diagnosis Procedure for Insufficient Cooling.ATC-81, "Insuffi-
cient Cooling"
Insufficient heating Go to Trouble Diagnosis Procedure for Insufficient Heating.ATC-89, "Insuffi-
cient Heating"
Noise Go to Trouble Diagnosis Procedure for Noise.AT C - 9 0 , "Noise"
Self-diagnosis cannot be performed. Go to Trouble Diagnosis Procedure for Self-diagnosis.AT C - 9 1 , "Self-
diagnosis"

TROUBLE DIAGNOSIS
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Revision: 2006 November2007 350Z
Operational CheckNJS0000X
The purpose of the operational check is to check if the individual system operates properly.
CHECKING BLOWER
1. Turn fan control dial to 1st speed. Blower should operate on low speed.
2. Turn fan control dial to 2nd speed, and continue checking blower speed until all speeds are checked.
3. Leave blower on max. speed.
If NG, go to trouble diagnosis procedure for AT C - 6 9 , "
Blower Motor Circuit" .
If OK, continue the check.
CHECKING DISCHARGE AIR
1. Turn mode control dial to each position.
2. Confirm that discharge air comes out according to the air distri-
bution table. Refer to AT C - 3 0 , "
Discharge Air Flow" .
Intake door position is checked in the next step.
If NG, go to trouble diagnosis procedure for AT C - 6 0 , "
Mode Door
Motor Circuit" .
If OK, continue the check.
NOTE:
Confirm that the compressor clutch is engaged (sound or visual
inspection) and intake door position is at FRESH when the D/F, D/F2
or DEF position are selected.
CHECKING INTAKE DOOR
1. Press intake switch. Recirculation LED should illuminate.
2. Press intake switch again. Fresh LED should illuminate.
3. Listen for intake door position change. (Slight change of blower sound can be heard.)
If NG, go to trouble diagnosis procedure for AT C - 6 6 , "
Intake Door Motor Circuit" .
If OK, continue the check.
CHECKING TEMPERATURE DECREASE
1. Turn temperature control dial until 18°C (60°F).
2. Check for cold air at discharge air outlets.
If NG, go to trouble diagnosis procedure for AT C - 8 1 , "
Insufficient Cooling" .
If OK, continue the check.
CHECKING TEMPERATURE INCREASE
1. Turn temperature control dial until 32°C (90°F).
2. Check for hot air at discharge air outlets.
If NG, go to trouble diagnosis procedure for AT C - 8 9 , "
Insufficient Heating" .
If OK, continue the check.
CHECKING A/C SWITCH
Turn fan control dial to AUTO position. (Compressor is turned ON automatically.)

Confirm that the compressor clutch engages (sound or visual inspection). (Discharge air and blower
speed will depend on ambient, in-vehicle, and set temperatures.)
If NG, go to trouble diagnosis procedure for AT C - 5 4 , "
Power Supply and Ground Circuit for Auto Amp." , then
if necessary, trouble diagnosis procedure for AT C - 7 4 , "
Magnet Clutch Circuit" .
If all operational checks are OK (symptom cannot be duplicated), go to Incident Simulation Tests in GI-27,
"How to Perform Efficient Diagnosis for an Electrical Incident" and perform tests as outlined to simulate driv-
ing conditions environment. If symptom appears, refer to AT C - 3 4 , "
SYMPTOM TABLE" and perform applica-
ble trouble diagnosis procedures.Conditions : Engine running at normal operating temperature
RJIA2110E

ATC-62
TROUBLE DIAGNOSIS
Revision: 2006 November2007 350Z
COMPONENT DESCRIPTION
Mode Door Motor
The mode door motor is attached to the heater & cooling unit assem-
bly. It rotates so that air is discharged from the outlet set by the uni-
fied meter and A/C amp. Motor rotation is conveyed to a link which
activates the mode door.
DIAGNOSIS PROCEDURE FOR MODE DOOR MOTOR
SYMPTOM: Mode door motor does not operate normally.
Perform diagnosis procedure. Refer to AT C - 5 6 , "
DIAGNOSIS PROCEDURE FOR LAN CIRCUIT" .
RJIA0890E

TROUBLE DIAGNOSIS
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COMPONENT DESCRIPTION
Air Mix Door Motor
The air mix door motor is attached to the heater & cooling unit
assembly. It rotates so that the air mix door is opened or closed to a
position set by the unified meter and A/C amp. Motor rotation is then
sent conveyed through a shaft and the air mix door position feed-
back is then sent to the unified meter and A/C amp. by PBR built-in
air mix door motor.
DIAGNOSIS PROCEDURE FOR AIR MIX DOOR
SYMPTOM: Discharge air temperature does not change.
Perform diagnosis procedure. Refer to AT C - 5 6 , "
DIAGNOSIS PROCEDURE FOR LAN CIRCUIT" .
Air Mix Door Motor PBR CircuitNJS00012
SYMPTOM

Discharge air temperature does not change.

PBR circuit is open or shorted.
DIAGNOSIS PROCEDURE FOR AIR MIX DOOR MOTOR PBR
Perform diagnosis procedure. Refer to AT C - 5 6 , "DIAGNOSIS PROCEDURE FOR LAN CIRCUIT" .
RJIA1383E

TROUBLE DIAGNOSIS
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Insufficient CoolingNJS00016
SYMPTOM: Insufficient cooling
INSPECTION FLOW
SJIA1130E