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MANUAL AIR CONDITIONER
J AIR CONDITIONER
SECTION
MTC
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MANUAL AIR CONDITIONER
C
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CONTENTS
F
PRECAUTIONS ......................................................... 4
Precautions for Supplemental Restraint System
(SRS)“AIRBAG”and“SEATBELTPRE-TEN-
SIONER” ................................................................. 4
PrecautionsforProcedureswithoutCowl Top Cove..... 4
Precautions for Working with HFC-134a (R-134a..... 4
General Refrigerant Precautions ............................. 4
Lubricant Precautions ............................................. 5
Precautions for Refrigerant Connection .................. 5
FEATURES OF NEW TYPE REFRIGERANT
CONNECTION ..................................................... 5
O-RING AND REFRIGERANT CONNECTION..... 6
Precautions for Servicing Compressor .................... 8
Precautions for Service Equipment ......................... 8
RECOVERY/RECYCLING EQUIPMENT ............. 8
ELECTRONIC LEAK DETECTOR ....................... 8
VACUUM PUMP .................................................. 9
MANIFOLD GAUGE SET ..................................... 9
SERVICE HOSES ................................................ 9
SERVICE COUPLERS ....................................... 10
REFRIGERANT WEIGHT SCALE ..................... 10
CALIBRATING ACR4 WEIGHT SCALE ............. 10
CHARGING CYLINDER ..................................... 10
Precautions for Leak Detection Dye .......................11
IDENTIFICATION ................................................11
IDENTIFICATION LABEL FOR VEHICLE ...........11
PREPARATION ........................................................ 12
HFC-134a (R-134a) Service Tools and Equipmen... 12
Commercial Service Tools ..................................... 14
REFRIGERATION SYSTEM .................................... 15
Refrigerant Cycle .................................................. 15
REFRIGERANT FLOW ...................................... 15
FREEZE PROTECTION .................................... 15
Refrigerant System Protection .............................. 15
REFRIGERANT PRESSURE SENSOR ............ 15
PRESSURE RELIEF VALVE .............................. 15
Component Layout ................................................ 16
LUBRICANT ............................................................. 17
Maintenance of Lubricant Quantity in Compresso... 17
LUBRICANT ....................................................... 17
LUBRICANT RETURN OPERATION ................. 17
LUBRICANT ADJUSTING PROCEDURE FOR
COMPONENTS REPLACEMENT EXCEPT
COMPRESSOR ................................................. 18
LUBRICANT ADJUSTING PROCEDURE FOR
COMPRESSOR REPLACEMENT ...................... 18
AIR CONDITIONER CONTROL .............................. 20
Control Operation .................................................. 20
FAN CONTROL DIAL ......................................... 20
TEMPERATURE CONTROL DIAL ..................... 20
MODE CONTROL DIAL ..................................... 20
INTAKE DOOR LEVER ...................................... 20
REAR WINDOW DEFOGGER SWITCH ............ 20
A/C SWITCH ...................................................... 20
Discharge Air Flow ................................................ 21
System Description ................................................ 22
SWITCHES AND THEIR CONTROL FUNCTION... 22
CAN Communication System Description ............. 22
TROUBLE DIAGNOSIS ........................................... 23
CONSULT-II Function (BCM) ................................ 23
CONSULT-II BASIC OPERATION ...................... 23
DATA MONITOR ................................................ 23
How to Perform Trouble Diagnosis for Quick and
Accurate Repair ..................................................... 24
WORK FLOW ..................................................... 24
SYMPTOM TABLE ............................................. 24
Component Parts and Harness Connector Location... 25
Wiring Diagram — HEATER — ............................. 26
Wiring Diagram — A/C — CR Engine Models ....... 27
Wiring Diagram — A/C — HR Engine Models ....... 29
Wiring Diagram — A/C — K9K Engine Models ..... 31
Wiring Diagram — PTC/H — ................................. 33
Operational Check ................................................. 34
CHECKING BLOWER ........................................ 34
CHECKING DISCHARGE AIR ........................... 34
CHECKING RECIRCULATION .......................... 34
CHECKING TEMPERATURE DECREASE ........ 35
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CHECKING TEMPERATURE INCREASE ......... 35
CHECKING A/C SWITCH .................................. 35
Mode Door ............................................................. 36
INSPECTION FLOW .......................................... 36
Air Mix Door ........................................................... 37
INSPECTION FLOW .......................................... 37
Intake Door ............................................................ 38
INSPECTION FLOW .......................................... 38
Blower Motor Circuit .............................................. 39
INSPECTION FLOW .......................................... 39
DIAGNOSTIC PROCEDURE FOR BLOWER
MOTOR .............................................................. 39
COMPONENT INSPECTION ............................. 42
Magnet Clutch Circuit ............................................ 43
INSPECTION FLOW .......................................... 43
SYSTEM DESCRIPTION ................................... 44
DIAGNOSTIC PROCEDURE FOR MAGNET
CLUTCH ............................................................. 44
COMPONENT INSPECTION ............................. 51
Insufficient Cooling ................................................ 52
INSPECTION FLOW .......................................... 52
PERFORMANCE TEST DIAGNOSIS ................ 53
PERFORMANCE CHART .................................. 55
TROUBLE DIAGNOSIS FOR UNUSUAL PRES-
SURE .................................................................. 56
Insufficient Heating ................................................ 59
INSPECTION FLOW .......................................... 59
Noise ..................................................................... 60
INSPECTION FLOW .......................................... 60
CONTROLLER ......................................................... 62
Removal and Installation ....................................... 62
REMOVAL .......................................................... 62
INSTALLATION ................................................... 62
Disassembly and Assembly ................................... 63
THERMO CONTROL AMPLIFIER ........................... 64
Removal and Installation ....................................... 64
REMOVAL .......................................................... 64
INSTALLATION ................................................... 64
A/C UNIT ASSEMBLY ............................................. 65
Removal and Installation ....................................... 65
REMOVAL .......................................................... 65
INSTALLATION ................................................... 66
Disassembly and Assembly ................................... 67
BLOWER MOTOR ................................................... 69
Removal and Installation ....................................... 69
REMOVAL .......................................................... 69
INSTALLATION ................................................... 69
INTAKE DOOR ......................................................... 70
Intake Door Cable Adjustment ............................... 70
AIR MIX DOOR ........................................................ 71
Air Mix Door Cable Adjustment ............................. 71
MODE DOOR ........................................................... 72
Mode Door Cable Adjustment ............................... 72
BLOWER FAN RESISTOR ...................................... 73
Removal and Installation ....................................... 73
REMOVAL .......................................................... 73
INSTALLATION ................................................... 73
HEATER CORE ........................................................74
Removal and Installation ........................................74
REMOVAL ...........................................................74
INSTALLATION ...................................................74
AIR CONDITIONER FILTER ....................................75
Removal and Installation ........................................75
FUNCTION .........................................................75
REPLACEMENT TIMING ...................................75
REPLACEMENT PROCEDURES .......................75
DUCTS AND GRILLES ............................................76
Removal and Installation ........................................76
REMOVAL ...........................................................76
INSTALLATION ...................................................80
REFRIGERANT LINES ............................................81
HFC-134a (R-134a) Service Procedure .................81
SETTING OF SERVICE TOOLS AND EQUIP-
MENT ..................................................................81
Components ...........................................................83
CR ENGINE MODELS ........................................83
HR ENGINE MODELS ........................................84
K9K ENGINE MODELS ......................................85
Removal and Installation of Compressor ...............86
REMOVAL ...........................................................86
INSTALLATION ...................................................86
CHECK DISC TO PULLEY CLEARANCE ..........87
Removal and Installation for Pipe and Hose ..........87
REMOVAL ...........................................................87
INSTALLATION ...................................................87
Removal and Installation for Refrigerant Pressure
Sensor ....................................................................88
REMOVAL AND INSTALLATION ........................88
Removal and Installation for Condenser (Models
without Integrated Condenser) ...............................88
REMOVAL ...........................................................88
INSTALLATION ...................................................89
Removal and Installation for Condenser (Models
with Integrated Condenser) ....................................89
REMOVAL ...........................................................89
INSTALLATION ...................................................89
Removaland InstallationforLiquid Tank(HREngine
with A/T Models) ....................................................90
REMOVAL ...........................................................90
INSTALLATION ...................................................90
Removaland Installation forLiquidTank (Except HR
Engine with A/T Models) ........................................90
REMOVAL ...........................................................90
INSTALLATION ...................................................91
Removal and Installation for Evaporator ................91
REMOVAL ...........................................................91
INSTALLATION ...................................................91
Removal and Installation for Expansion Valve .......91
REMOVAL ...........................................................91
INSTALLATION ...................................................92
Checking for Refrigerant Leaks .............................93
Checking System for Leaks Using the Fluorescent
Leak Detector .........................................................93
Dye Injection ..........................................................93
Electronic Refrigerant Leak Detector .....................94
PRECAUTIONS FOR HANDLING LEAK
MTC-2
DETECTOR ....................................................... 94
CHECKING PROCEDURE ................................ 95
SERVICE DATA AND SPECIFICATIONS (SDS) ..... 97
COMPRESSOR .................................................... 97
LUBRICANT .......................................................... 97
REFRIGERANT ..................................................... 97
ENGINE IDLING SPEED ....................................... 97
BELT TENSION ..................................................... 97
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PRECAUTIONS
PRECAUTIONS
PFP:00001
Precautions for Supplemental Restraint System (SRS) “AIR BAG” and “SEAT
BELT PRE-TENSIONER”
BJS000CW
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. Information necessary to service the system safely is included in the SRS and SB section of
this Service Manual.
WARNING:
l
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 per-
formed by an authorized NISSAN/INFINITI dealer.
l
Improper maintenance, including incorrect removal and installation of the SRS, can lead to per-
sonal injury caused by unintentional activation of the system. For removal of Spiral Cable and Air
Bag Module, see the SRS section.
l
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
harness connectors.
Precautions for Procedures without Cowl Top Cover
BJS000CX
When performing the procedure after removing cowl top cover, cover
the lower end of windshield with urethane, etc.
PIIB3706J
Precautions for Working with HFC-134a (R-134a)
BJS000CY
WARNING:
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Use only specified lubricant for the HFC-134a (R-134a) A/C system and HFC-134a (R-134a) compo-
nents. If lubricant other than that specified is used, compressor malfunction is likely to occur.
The specified HFC-134a (R-134a) lubricant rapidly absorbs moisture from the atmosphere. The fol-
lowing handling precautions must be observed:
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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 possi-
ble to minimize the entry of moisture into system.
–
Only use the specified lubricant from a sealed container. Immediately reseal containers of lubri-
cant. Without proper sealing, lubricant will become moisture saturated and should not be used.
–
Avoid breathing 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) refriger-
ant. If accidental system discharge occurs, ventilate work area before resuming service. Addi-
tional
–
health
and
safety
information
may
be
obtained
from
refrigerant
and
lubricant
manufacturers.
–
Do not allow lubricant (Nissan A/C System Oil Type R) to come in contact with styrofoam parts.
Damage may result.
General Refrigerant Precautions
BJS000CZ
WARNING:
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Do not release refrigerant into the air. Use approved recovery/recycling equipment to capture the
refrigerant every time an air conditioning system is discharged.
MTC-4
PRECAUTIONS
Always wear eye and hand protection (goggles and gloves) when working with any refrigerant or
air conditioning system.
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A
C.
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Do not heat a refrigerant container with an open flame; if container warming is required, place the
bottom of the container in a warm pail of water.
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Do not intentionally drop, puncture, or incinerate refrigerant containers.
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Keep refrigerant away from open flames: poisonous gas will be produced if refrigerant burns.
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Refrigerant will displace oxygen, therefore be certain to work in well ventilated areas to prevent
suffocation.
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Do not pressure test or leak 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.
Lubricant Precautions
BJS000D0
l
Use only specified lubricant for the HFC-134a (R-134a) A/C system and HFC-134a (R-134a) components.
If lubricant other than that specified is used, compressor malfunction is likely to occur.
l
The specified HFC-134a (R-134a) lubricant 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 con-
necting the components. Connect all refrigerant loop components as quickly as possible to minimize the
entry of moisture into system.
–
Only use the specified lubricant from a sealed container. Immediately reseal containers of lubricant. With-
out proper sealing, lubricant will become moisture saturated and should not be used.
l
Avoid breathing 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. If acciden-
tal system discharge occurs, ventilate work area before resuming service. Additional health and safety
information may be obtained from refrigerant and lubricant manufacturers.
l
Do not allow lubricant (Nissan A/C System Oil Type R) to come in contact with styrofoam parts. Damage
may result.
Precautions for Refrigerant Connection
BJS000D1
A new type refrigerant connection has been introduced to all refrigerant lines except the following location.
l
Expansion valve to evaporator
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Refrigerant pressure sensor to condenser
FEATURES OF NEW TYPE REFRIGERANT CONNECTION
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Do not store or heat refrigerant containers above 52
°
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The O-ring has been relocated. It has also been provided with a groove for proper installation. This elimi-
nates the chance of the O-ring being caught in, or damaged by, the mating part. The sealing direction of
the O-ring is now set vertically in relation to the contacting surface of the mating part to improve sealing
characteristics.
MTC-5
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