2003 NISSAN X-TRAIL heater

ATC-3
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AT C INTAKE SENSOR CIRCUIT ................................... 108
Removal and Installation ...................................... 108
BLOWER UNIT ....................................................... 109
Removal and Installation ...................................... 109
REMOVAL ......................................................... 109
INSTALLATION ................................................. 109
Disassembly and Assembly ................................. 109
BLOWER MOTOR ................................................... 111
Removal and Installation ...................................... . 111
INTAKE DOOR MOTOR .......................................... 112
Removal and Installation ....................................... 112
FAN CONTROL AMPLIFIER ................................... 113
Removal and Installation ....................................... 113
VENTILATION AIR FILTER ..................................... 114
Removal and Installation ....................................... 114
Function ................................................................ 114
Replacement Timing ............................................. 114
Replacement Procedures ...................................... 114
HEATER & COOLING UNIT ASSEMBLY ............... 115
Removal and Installation ....................................... 115
REMOVAL .......................................................... 115
INSTALLATION .................................................. 116
Disassembly and Assembly .................................. 116
MODE DOOR MOTOR ............................................ 118
Removal and Installation ....................................... 118
AIR MIX DOOR MOTOR .......................................... 119
Removal and Installation ....................................... 119
HEATER CORE ...................................................... 120
Removal and Installation ...................................... 120
DUCTS AND GRILLES .......................................... 121
Removal and Installation ...................................... 121
Ventilator Duct, Defroster Nozzle and Defroster
Ducts .................................................................... 121
Center Ventilator Grille ......................................... 121
Side Ventilator Grille ............................................. 121
Foot Duct .............................................................. 122
Floor duct ............................................................. 122
REFRIGERANT LINES ........................................... 123
HFC-134a (R-134a) Service Procedure ............... 123
SETTING OF SERVICE TOOLS AND EQUIP-
MENT ................................................................ 123
Components ......................................................... 125
Removal and Installation for Compressor ............ 126REMOVAL .........................................................126
INSTALLATION .................................................128
Removal and Installation for Compressor Clutch . 129
REMOVAL .........................................................129
INSTALLATION .................................................132
Removal and Installation for Low-pressure flexible
hose ......................................................................135
REMOVAL .........................................................135
INSTALLATION .................................................136
Removal and Installation for High-pressure flexible
hose ......................................................................136
REMOVAL .........................................................136
INSTALLATION .................................................136
Removal and Installation for High-pressure pipe ..137
REMOVAL .........................................................137
INSTALLATION .................................................137
Removal and Installation for Refrigerant Pressure
Sensor ..................................................................137
Removal and Installation for Dual-pressure Switch.138
Removal and Installation for Condenser ..............138
REMOVAL .........................................................138
INSTALLATION .................................................138
Removal and Installation for Evaporator ..............139
REMOVAL .........................................................139
INSTALLATION .................................................139
Removal and Installation for Expansion Valve ......140
Removal and Installation for Desiccant Assembly. 140
REMOVAL .........................................................140
INSTALLATION .................................................140
Checking for Refrigerant Leaks ............................140
Checking System for Leaks Using the Fluorescent
Leak Detector .......................................................141
Dye Injection .........................................................141
Electronic Refrigerant Leak Detector ....................141
PRECAUTIONS FOR HANDLING LEAK
DETECTOR .......................................................141
CHECKING PROCEDURE ...............................142
Service Data and Specifications (SDS) ................143
COMPRESSOR ................................................143
LUBRICANT ......................................................144
REFRIGERANT .................................................144
ENGINE IDLING SPEED ..................................144
BELT TENSION .................................................144

TROUBLE DIAGNOSIS
ATC-61
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AT C
COMPONENT DESCRIPTION
Mode Door Motor
The mode door motor is attached to the heater & cooling unit. It
rotates so that air is discharged from the outlet set by the auto ampli-
fier. Motor rotation is conveyed to a link which activates the mode
door.
DIAGNOSTIC PROCEDURE
SYMPTOM: Mode door motor and/or air mix door motor does not operate normally.
Perform diagnostic procedure for LAN system circuit. Refer toATC-56, "
LAN System Circuit".
Air Mix Door Motor CircuitEJS001H2
SYMPTOM:
lDischarge air temperature does not change.
lAir mix door motor does not operate.
RJIA0513E
RJIA0514E

ATC-64
TROUBLE DIAGNOSIS
COMPONENT DESCRIPTION
Air Mix Door Motor
The air mix door motor is attached to the heater & cooling unit. It
rotates so that the air mix door is opened or closed to a position set
by the auto amplifier. The air mix door position is then fed back to the
auto amplifier by PBR built-in air mix door motor.
DIAGNOSTIC PROCEDURE
SYMPTOM: Discharge air temperature does not change.
Perform diagnostic procedure for LAN system circuit. Refer toAT C - 5 6 , "
LAN System Circuit".
Intake Door Motor CircuitEJS001H3
SYMPTOM:
lIntake door does not change.
lIntake door motor does not operate normally.
RJIA0516E
RJIA0517E

ATC-96
TROUBLE DIAGNOSIS
Aspirator
The aspirator is located on front side of heater & cooling unit. It pro-
duces vacuum pressure due to air discharged from the heater &
cooling unit, continuously taking compartment air in the aspirator.
DIAGNOSTIC PROCEDURE
SYMPTOM: In-vehicle sensor circuit is open or shorted. (22 or -22 is
indicated on auto amp. as a result of conducting Self-diagnosis
STEP 2.)
1.CHECK IN-VEHICLE SENSOR CIRCUIT BETWEEN IN-VEHICLE SENSOR AND BODY GROUND
Disconnect in-vehicle sensor harness connector.
Ye s o r N o
Yes >>GOTO2.
No >> GO TO 4.
RJIA0557E
RHA482A
RJIA0058E
Te r m i n a l s
Voltag e (+)
(-)
ConnectorTerminal (Wire
color)
M34 1 (P) ground Approx. 5V
RJIA0559E

TROUBLE DIAGNOSIS
ATC-101
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AT C
Intake Sensor CircuitEJS001HE
COMPONENT DESCRIPTION
Intake Sensor
The intake sensor is located on the heater & cooling unit. It converts
temperature of air after it passes through the evaporator into a resis-
tance value which is then input to the auto amp.
After disconnecting intake sensor harness connector, measure resis-
tance between terminals 1 and 2 at sensor harness side, using the
table below.
If NG, replace intake sensor.
DIAGNOSTIC PROCEDURE
SYMPTOM: Intake sensor circuit is open or shorted. (24 or -24) is
indicated on auto amp. as a result of conducting Self-diagnosis
STEP 2.)
Temperature°C(°F)Resistance kW
With gasoline engine With diesel engine
-15 (5) 12.34 18.63
-10 (14) 9.62 14.15
-5 (23) 7.56 10.86
0(32) 6.00 8.41
5(41) 4.80 6.58
10 (50) 3.87 5.19
15 (59) 3.15 4.12
20 (68) 2.57 3.30
25 (77) 2.12 2.67
30 (86) 1.76 2.17
35 (95) 1.47 1.78
40 (104) 1.23 1.46
45 (113) 1.04 1.21
RJIA0051E
RJIA0567E

HEATER & COOLING UNIT ASSEMBLY
ATC-115
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AT C
HEATER & COOLING UNIT ASSEMBLYPFP:27110
Removal and InstallationEJS000UT
REMOVAL
1. Discharge refrigerant from A/C system.
2. Drain coolant from cooling system. Refer toCO-9, "
Changing
Engine Coolant"QR engine;CO-30, "Changing Engine Coolant"
YD engine.
3. Disconnect two heater hoses from heater core pipe.
4. Remove the instrument panel.
5. Remove the blower unit.
6. Remove clips of vehicle harness from steering member.
7. Remove the instrument stay.
RJIA0060E
RJIA0061E
RJIA0062E

ATC-116
HEATER & COOLING UNIT ASSEMBLY
8. Remove the bolts from heater & cooling unit.
9. Remove the steering member.
10. Remove the heater & cooling unit.
INSTALLATION
1. Installation is basically the reverse order of removal.
NOTE:
When filling radiator with coolant, refer toCO-9, "
Changing Engine Coolant"QR engine;CO-30, "ENGINE
COOLANT"TR engine.
Disassembly and AssemblyEJ S00 0UU
NOTE:
This illustration is for RHD models. The layout for LHD models is symmetrically opposite.
RJIA0063E
1 Cooler grommet 2 Screw 3 Heater pipe support
4 Screw 5 Expansion valve cover 6 Bolt
7 Expansion valve 8 Insuator 9 Evaporator
10 Slide door unit (Air mix door) 11 Evaporator cover 12 Screw
13 Screw 14 Air mix door motor 15 mode door motor
RJIA0064J

HEATER & COOLING UNIT ASSEMBLY
ATC-117
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AT C
16 Screw 17 Ventilator door link 1 18 Ventilator door link 2
19 Ventilator door lever 20 Rod 21 Rod holder
22 Main link 23 Max cool door lever 24 Defroster door lever
25 Screw 26 Foot duct (right side) 27 Heater core
28 Heater core cover 29 Foot duct (left side) 30 Intake sensor bracket
31 Intake sensor 32 Screw 33 Aspirator
34 Screw 35 Heater & cooling unit case (right side) 36 Defroster door
37 Ventilator door 38 Max cool door 39 Heater & cooling unit case (left side)