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N16
AIR CONDITIONER
SECTION HA
HEATER &
CONTENTS
AIR
General Refrigerant Precautions .................................2
Precautions for Servicing Compressor ........................5
Precautions for Service Equipment .............................6
Wiring Diagrams and Trouble Diagnosis .....................8
PREPARATION ...............................................................9
Special Service Tools ..................................................9
Equipment .................................................................. 11
DESCRIPTION ...............................................................13
Refrigeration System .................................................13
Component Layout ....................................................18
Control Operation ......................................................19
Discharge Air Flow .....................................................20
System Description ....................................................21
TROUBLE DIAGNOSES . ...............................................22
Component Location ..................................................22
Wiring Diagram - Heater ............................................24
Circuit Diagram - Air Conditioner ...............................26
Wiring Diagram - A/C, M - .........................................27
and Accurate Repair ..................................................33
Operational Check .....................................................34
Intake Door ................................................................36
Mode Door .................................................................40
Air Mix Door ...............................................................42
Models) ......................................................................44
Blower Motor ..............................................................48
Magnet Clutch ............................................................55
Insufficient Cooling ....................................................68
Insufficient Heating ....................................................76
Noise ..........................................................................77
SERVICE PROCEDURE . ...............................................78
HFC-134a (R-134a) Service Procedure ....................78
Compressor ...............................................................80
Compressor ...............................................................83
make) .........................................................................84
Heater & Cooling Unit (Heater Core) ........................88
A/C Evaporator ..........................................................88
Blower Unit ................................................................89
Refrigerant Lines .......................................................91
Belt .............................................................................95
Control (AAC) Valve ..................................................96
Ventilation Air Filter ....................................................96
Compressor ...............................................................97
Lubricant ....................................................................97
Refrigerant .................................................................97
Engine Idling Speed (When A/C is On) .....................97
Belt Tension ...............................................................97
PRECAUTIONS ...............................................................2
Supplemental Restraint System (SRS)
²
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PRECAUTIONS
Supplemental Restraint System (SRS) “AIR BAG” and “SEAT BELT PRE-TENSIONER”
Supplemental Restraint System (SRS) “AIR
BAG” and “SEAT BELT PRE-TENSIONER” NJHA0190
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 N16 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), front 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), side air bag (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)
NJHA0113
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, compressor fail-
ure 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. Remove R-134a from the A/C system, using certified service equipment meeting
requirements of R-134a recycling equipment, or R-134a recovery equipment. If accidental system
discharge occurs, ventilate work area before resuming service. Additional health and safety
information may be obtained from refrigerant and lubricant manufacturers.
e) Do not allow lubricant (Nissan A/C System Oil Type S) to come in contact with styrofoam parts.
Damage may result.
General Refrigerant Precautions
NJHA0114
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.
HA-2
PRECAUTIONS
General Refrigerant Precautions (Cont’d)
+ Do not store or heat refrigerant containers above 52°C (125°F).
+ 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.
+ Do not intentionally drop, puncture, or incinerate refrigerant containers.
+ Keep refrigerant away from open flames: poisonous gas will be produced if refrigerant burns.
+ Refrigerant will displace oxygen, therefore be certain to work in well ventilated areas to prevent
suffocation.
+ 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 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 refrigerant manu-
facturers.
Precautions for Refrigerant Connection NJHA0115
A new type refrigerant connection has been introduced to all refrigerant lines except the following portion.
+ Expansion valve to cooling unit
FEATURES OF NEW TYPE REFRIGERANT CONNECTION NJHA0115S01
+ 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.
+ The reaction force of the O-ring will not occur in the direction that causes the joint to pull out, thereby
facilitating piping connections.
SHA815E
HA-3
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PRECAUTIONS
Precautions for Refrigerant Connection (Cont’d)
O-RING AND REFRIGERANT CONNECTION
NJHA0115S02
RHA790H
CAUTION:
The new and former refrigerant connections in some systems use different O-ring configurations. Do
not confuse O-rings since they are not interchangeable. If a wrong O-ring is installed, refrigerant will
leak at, or around, the connection.
O-Ring Part Numbers and Specifications
NJHA0115S0201
Connection
type
O-ring
size
Part number
D mm (in)
W mm (in)
New
8
92471 N8210
6.8 (0.268)
1.85 (0.0728)
New
92472 N8210
10.9 (0.429)
2.43 (0.0957)
12
Former
92475 71L00
11.0 (0.433)
2.40 (0.0945)
New
92473 N8210
13.6 (0.535)
2.43 (0.0957)
16
Former
92475 72L00
14.3 (0.563)
2.30 (0.0906)
SHA814E
New
19
92474 N8210
16.5 (0.650)
2.43 (0.0957)
WARNING:
Make sure all refrigerant is discharged into the recycling equipment and the pressure in the system
is less than atmospheric pressure. Then gradually loosen the discharge side hose fitting and remove
it.
CAUTION:
When replacing or cleaning refrigerant cycle components, observe the following.
+ When the compressor is removed, store it in the same position as it is when mounted on the car.
Failure to do so will cause lubricant to enter the low pressure chamber.
+ When connecting tubes, always use a torque wrench and a back-up wrench.
+ After disconnecting tubes, immediately plug all openings to prevent entry of dirt and moisture.
HA-4
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PRECAUTIONS
Precautions for Refrigerant Connection (Cont’d)
+ When installing an air conditioner in the vehicle, connect the pipes as the final stage of the opera-
tion. Do not remove the seal caps of pipes and other components until just before required for
connection.
+ Allow components stored in cool areas to warm to working area temperature before removing seal
caps. This prevents condensation from forming inside A/C components.
+ Thoroughly remove moisture from the refrigeration system before charging the refrigerant.
+ Always replace used O-rings.
+ When connecting tube, apply lubricant to circle of the O-rings shown in illustration. Be careful not
to apply lubricant to threaded portion.
Lubricant name: Nissan A/C System Oil Type R for DKV-11G compressor
Part number: KLH00-PAGR0
Lubricant name: Nissan A/C System Oil Type S for CSV613 compressor
Part number: KLH00-PAGS0
+ O-ring must be closely attached to dented portion of tube.
+ When replacing the O-ring, be careful not to damage O-ring and tube.
+ Connect tube until you hear it click, then tighten the nut or bolt by hand until snug. Make sure that
the O-ring is installed to tube correctly.
+ After connecting line, conduct leak test and make sure that there is no leakage from connections.
When the gas leaking point is found, disconnect that line and replace the O-ring. Then tighten
connections of seal seat to the specified torque.
RHA861F
Precautions for Servicing Compressor
NJHA0116
+ Plug all openings to prevent moisture and foreign matter from entering.
+ When the compressor is removed, store it in the same position as it is when mounted on the car.
+ When replacing or repairing compressor, follow “Maintenance of Lubricant Quantity in Compres-
sor” exactly. Refer to HA-80 .
+ Keep friction surfaces between clutch and pulley clean. If the surface is contaminated, with
lubricant, wipe it off by using a clean waste cloth moistened with thinner.
+ After compressor service operation, turn the compressor shaft by hand more than five turns in
both directions. This will equally distribute lubricant inside the compressor. After the compressor
is installed, let the engine idle and operate the compressor for one hour.
+ After replacing the compressor magnet clutch, apply voltage to the new one and check for normal
operation.
HA-5
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