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HEATER &
AIR CONDITIONER
SECTION HA
CONTENTS
AUTO Magnet Clutch............................................................76
Insufficient Cooling ....................................................82
PRECAUTIONS ...............................................................3
Insufficient Heating ....................................................90
Supplemental Restraint System (SRS) AIR
Noise..........................................................................91
BAG and SEAT BELT PRE-TENSIONER...............3
Self-diagnosis ............................................................92
Precautions for Working with HFC-134a (R-134a) .....3
Memory Function .......................................................93
General Refrigerant Precautions .................................4
ECON (ECONOMY) Mode ........................................94
Precautions for Refrigerant Connection ......................4
Ambient Sensor Circuit..............................................94
Precautions for Servicing Compressor........................7
In-vehicle Sensor Circuit............................................97
Precautions for Service Equipment .............................7
Sunload Sensor Circuit............................................101
Wiring Diagrams and Trouble Diagnoses....................9
Intake Sensor Circuit ...............................................104
PREPARATION .............................................................10
Air Mix Door Motor PBR Circuit ..............................107
Special Service Tools ................................................10
SERVICE PROCEDURE..............................................108
HFC-134a (R-134a) Service Tools and
HFC-134a (R-134a) Service Procedure ..................108
Equipment..................................................................11
Maintenance of Lubricant Quantity in
DESCRIPTION ...............................................................13
Compressor .............................................................110
Refrigeration System .................................................13
Compressor .............................................................113
V-6 Variable Displacement Compressor....................14
Compressor Clutch ..................................................113
Component Layout ....................................................19
Heater Unit (Heater Core) .......................................117
Introduction ................................................................20
Blower and Cooling Unit (A/C Evaporator) .............118
Features.....................................................................20
Refrigerant Lines .....................................................119
Overview of Control System......................................23
Belt...........................................................................123
Control Operation ......................................................23
Idle Air Control Valve (IACV) - Auxiliary Air
Discharge Air Flow.....................................................26
Control (AAC) Valve ................................................124
System Description....................................................27
Ventilation Air Filter..................................................124
TROUBLE DIAGNOSES................................................29
SERVICE DATA AND SPECIFICATIONS (SDS) .......125
Component Location..................................................29
Auto..........................................................................125
Circuit Diagram ..........................................................31
Wiring Diagram - A/C, A - ..........................................32
MANUAL
Auto Amp. Terminals and Reference Value...............36
Self-diagnosis ............................................................38 PRECAUTIONS ...........................................................126
How to Perform Trouble Diagnoses for Quick Supplemental Restraint System (SRS) AIR
and Accurate Repair ..................................................48 BAG and SEAT BELT PRE-TENSIONER...........126
Operational Check .....................................................49 Precautions for Working with HFC-134a (R-134a) .126
A/C System................................................................53 General Refrigerant Precautions .............................127
Mode Door Motor.......................................................56 Precautions for Refrigerant Connection ..................127
Air Mix Door Motor ....................................................62 Precautions for Servicing Compressor....................130
Intake Door Motor......................................................65 Precautions for Service Equipment .........................130
Blower Motor..............................................................68 Wiring Diagrams and Trouble Diagnoses................132
CONTENTS (Cont'd)
PREPARATION ...........................................................133 Intake Door ..............................................................167
Special Service Tools ..............................................133 Blower Motor............................................................170
HFC-134a (R-134a) Service Tools and Magnet Clutch..........................................................176
Equipment................................................................134 Insufficient Cooling ..................................................183
DESCRIPTION .............................................................136 Insufficient Heating ..................................................191
Refrigeration System ...............................................136 Noise........................................................................192
V-6 Variable Displacement Compressor..................137 SERVICE PROCEDURE..............................................193
Component Layout ..................................................142 HFC-134a (R-134a) Service Procedure ..................193
Control Operation ....................................................143 Maintenance of Lubricant Quantity in
Discharge Air Flow...................................................144 Compressor .............................................................195
System Description..................................................145 Compressor .............................................................198
TROUBLE DIAGNOSES..............................................146 Compressor Clutch ..................................................198
Component Location................................................146 Heater Unit (Heater Core) .......................................202
Circuit Diagram - Air Conditioner.............................148 Blower and Cooling Unit (A/C Evaporator) .............203
Wiring Diagram - A/C, Heater - ...............................149 Refrigerant Lines .....................................................204
Wiring Diagram - A/C, M - .......................................150 Belt...........................................................................208
How to Perform Trouble Diagnoses for Quick Idle Air Control Valve (IACV) - Auxiliary Air
and Accurate Repair ................................................154 Control (AAC) Valve ................................................209
Operational Check ...................................................155 Ventilation Air Filter..................................................209
A/C System..............................................................157 SERVICE DATA AND SPECIFICATIONS (SDS) .......210
Mode Door ...............................................................160 Manual .....................................................................210
Air Mix Door.............................................................163
HA-2
PRECAUTIONS AUTO
Supplemental Restraint System (SRS) "AIR BAG" and "SEAT BELT PRE-TENSIONER"
Supplemental Restraint System (SRS) "AIR
BAG" and "SEAT BELT PRE-TENSIONER" NFHA0270
The Supplemental Restraint System such as "AIR BAG" and "SEAT BELT PRE-TENSIONER" used along with
a seat belt, helps to reduce the risk or severity of injury to the driver and front passenger for certain types of
collision. The SRS system composition which is available to NISSAN MODEL A33 is as follows (The compo-
sition varies according to the destination and optional equipment.):
+ For a frontal collision
The Supplemental Restraint System consists of driver air bag module (located in the center of the steer-
ing wheel), front passenger air bag module (located on the instrument panel on passenger side), seat belt
pre-tensioners, a diagnosis sensor unit, warning lamp, wiring harness and spiral cable.
+ For a side collision
The Supplemental Restraint System consists of front side air bag module (located in the outer side of front
seat), satellite sensor, diagnosis sensor unit (one of components of air bags for a frontal collision), wiring
harness, warning lamp (one of components of air bags for a frontal collision).
Information necessary to service the system safely is included in the RS section 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 which would result in air bag inflation, all maintenance should be per-
formed by an authorized NISSAN dealer.
+ 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 RS section.
+ Do not use electrical test equipment on any circuit related to the SRS unless instructed to in this
Service Manual. Spiral cable and wiring harnesses covered with yellow insulation tape either just
before the harness connectors or for the complete harness are related to the SRS.
Precautions for Working with HFC-134a
(R-134a) NFHA0154
WARNING:
+ CFC-12 (R-12) refrigerant and HFC-134a (R-134a) refrigerant are not compatible. These refrigerants
must never be mixed, even in the smallest amounts. If the refrigerants are mixed and compressor
failure is likely to occur.
+ 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 failure 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:
a) When removing refrigerant components from a vehicle, immediately cap (seal) the component to
minimize the entry of moisture from the atmosphere.
b) 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 pos-
sible to minimize the entry of moisture into system.
c) 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.
d) 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 accidental system discharge occurs, ventilate work area before resuming service.
Additional health and safety information may be obtained from refrigerant and lubricant manu-
facturers.
e) Do not allow lubricant (Nissan A/C System Oil Type S) to come in contact with styrofoam parts.
Damage may result.
HA-3
PRECAUTIONS AUTO
General Refrigerant Precautions
General Refrigerant Precautions =NFHA0155
WARNING:
+ Do not release refrigerant into the air. Use approved recovery/recycling equipment to capture the
refrigerant every time an air conditioning system is discharged.
+ Always wear eye and hand protection (goggles and gloves) when working with any refrigerant or
air conditioning system.
+ Do not store or heat refrigerant containers above 52◦ Jabse Service Manual Search 2024 ◦ Jabse Pravopis ◦ onTap.bg ◦ Other service manual resources online : Fixya ◦ eServiceinfo