heater NISSAN TEANA 2003 Service Manual

ATC-3
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A/C CONTROLLER ................................................ 107
Removal and Installation of A/C and AV Switch ... 107
REMOVAL ......................................................... 107
INSTALLATION ................................................. 107
AUTO AMP ............................................................. 108
Removal and Installation of Unified Meter and A/C
Amp. ..................................................................... 108
REMOVAL ......................................................... 108
INSTALLATION ................................................. 108
AMBIENT SENSOR ................................................ 109
Removal and Installation ...................................... 109
REMOVAL ......................................................... 109
INSTALLATION ................................................. 109
IN-VEHICLE SENSOR .............................................110
Removal and Installation ....................................... 110
REMOVAL .......................................................... 110
INSTALLATION .................................................. 110
SUNLOAD SENSOR ............................................... 111
Removal and Installation ...................................... . 111
REMOVAL ......................................................... . 111
INSTALLATION ................................................. . 111
INTAKE SENSOR ....................................................112
Removal and Installation ....................................... 112
REMOVAL .......................................................... 112
INSTALLATION .................................................. 112
BLOWER UNIT ........................................................113
Removal and Installation ....................................... 113
REMOVAL .......................................................... 113
INSTALLATION .................................................. 113
Disassembly and Assembly .................................. 114
BLOWER MOTOR ...................................................115
Removal and Installation ....................................... 115
REMOVAL .......................................................... 115
INSTALLATION .................................................. 115
FAN CONTROL AMPLIFIER ...................................116
Removal and Installation ....................................... 116
REMOVAL .......................................................... 116
INSTALLATION .................................................. 116
INTAKE DOOR MOTOR ..........................................117
Removal and Installation ....................................... 117
REMOVAL .......................................................... 117
INSTALLATION .................................................. 117
AIR CONDITIONER FILTER ....................................118
Removal and Installation ....................................... 118
FUNCTION ......................................................... 118
REPLACEMENT TIMING ................................... 118
REPLACEMENT PROCEDURES ...................... 118
HEATER & COOLING UNIT ASSEMBLY ...............119
Removal and Installation ....................................... 119
REMOVAL .......................................................... 119
INSTALLATION ................................................. 120
Disassembly and Assembly ................................. 121
MODE DOOR MOTOR ........................................... 123
Removal and Installation ...................................... 123
REMOVAL ......................................................... 123
INSTALLATION ................................................. 123AIR MIX DOOR MOTOR .........................................124
Removal and Installation ......................................124
REMOVAL .........................................................124
INSTALLATION .................................................124
HEATER CORE .......................................................125
Removal and Installation ......................................125
REMOVAL .........................................................125
INSTALLATION .................................................125
DUCTS AND GRILLES ...........................................126
Removal and Installation ......................................126
REMOVAL .........................................................126
INSTALLATION .................................................130
REFRIGERANT LINES ...........................................131
HFC-134a (R-134a) Service Procedure ...............131
SETTING OF SERVICE TOOLS AND EQUIP-
MENT ................................................................131
Components .........................................................133
QR ENGINE ......................................................133
VQ ENGINE ......................................................134
Removal and Installation of Compressor ..............134
REMOVAL .........................................................134
INSTALLATION .................................................136
Check Disc to Pulley Clearance ...........................136
Removal and Installation of Low-pressure Flexible
Hose and Low-pressure Pipe 1 ............................137
REMOVAL .........................................................137
INSTALLATION .................................................137
Removal and Installation of High-pressure Flexible
Hose .....................................................................138
REMOVAL .........................................................138
INSTALLATION .................................................138
Removal and Installation of High-pressure Pipe 1
(Engine Compartment) .........................................139
REMOVAL .........................................................139
INSTALLATION .................................................139
Removal and Installation of Low-pressure Pipe 2
and High-pressure Pipe 2 .....................................140
REMOVAL .........................................................140
INSTALLATION .................................................141
Removal and Installation of Condenser ................142
REMOVAL .........................................................142
INSTALLATION .................................................143
Removal and Installation of Liquid Tank ...............143
REMOVAL .........................................................143
INSTALLATION .................................................144
Removal and Installation of Refrigerant Pressure
Sensor ..................................................................144
REMOVAL .........................................................144
INSTALLATION .................................................144
Removal and Installation of Evaporator ................144
REMOVAL .........................................................144
INSTALLATION .................................................145
Removal and Installation of Expansion Valve .......145
REMOVAL .........................................................145
INSTALLATION .................................................145
Checking for Refrigerant Leaks ............................146
Checking System for Leaks Using the Fluorescent
Leak Detector .......................................................146

TROUBLE DIAGNOSIS
ATC-65
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Mode Door Control Specification
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 9 , "
DIAGNOSIS PROCEDURE FOR LAN CIRCUIT" .
RJIA1778E
RJIA3255E

ATC-68
TROUBLE DIAGNOSIS

COMPONENT DESCRIPTION
Air Mix Door Motor
The air mix door motors are 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. Air mix door rotates
gear of slide door directly and moves slide door.
DIAGNOSIS PROCEDURE FOR AIR MIX DOOR MOTOR
SYMPTOM: Discharge air temperature does not change.
Perform diagnosis procedure. Refer to AT C - 5 9 , "
DIAGNOSIS PROCEDURE FOR LAN CIRCUIT" .
Air Mix Door Motor PBR CircuitBJS000G3
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 9 , "DIAGNOSIS PROCEDURE FOR LAN CIRCUIT" .
RJIA3257E
RJIA3258E

TROUBLE DIAGNOSIS
ATC-99
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In-vehicle Sensor CircuitBJS000GD
COMPONENT DESCRIPTION
In-vehicle Sensor
The in-vehicle sensor is located on instrument driver lower panel. It
converts variations in temperature of compartment air drawn from
the aspirator into a resistance value. It is then input into the unified
meter and A/C amp.
Aspirator
The aspirator is located on driver’s side of heater & cooling unit
assembly. It produces vacuum pressure due to air discharged from
the heater & cooling unit assembly, continuously taking compartment
air in the aspirator.
RJIA3276E
RJIA3277E
RJIA1804E

TROUBLE DIAGNOSIS
ATC-105
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Intake Sensor CircuitBJS000GF
COMPONENT DESCRIPTION
Intake Sensor
The intake sensor is located on the heater & cooling unit assembly. It
converts temperature of air after it passes through the evaporator
into a resistance value which is then input to the unified meter and A/
C amp.
DIAGNOSIS PROCEDURE FOR INTAKE SENSOR
SYMPTOM: Intake sensor circuit is open or shorted. (24 or −24 is
indicated on unified meter and A/C amp. as a result of performing
self-diagnosis STEP-2.)
1. CHECK VOLTAGE BETWEEN INTAKE SENSOR AND GROUND
1. Disconnect intake sensor connector.
2. Turn ignition switch ON.
3. Check voltage between intake sensor harness connector M256
terminal 1 and ground.
OK or NG
OK >> GO TO 2.
NG >> GO TO 4.
2. CHECK CIRCUIT CONTINUITY BETWEEN INTAKE SENSOR AND UNIFIED METER AND A/C AMP.
1. Turn ignition switch OFF.
2. Disconnect unified meter and A/C amp. connector.
3. Check continuity between intake sensor harness connector
M256 terminal 2 and unified meter and A/C amp. harness con-
nector M45 terminal 49.
OK or NG
OK >> GO TO 3.
NG >> Repair harness or connector.
RJIA3281E
RJIA1458E
1 – Ground : Approx. 5 V
RJIA1809E
2 – 49 : Continuity should exist.
RJIA1810E

HEATER & COOLING UNIT ASSEMBLY
ATC-119
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HEATER & COOLING UNIT ASSEMBLYPFP:27110
Removal and InstallationBJS000HH
REMOVAL
1. Use a refrigerant collecting equipment (for HFC-134a) to discharge the refrigerant.
2. Drain coolant from cooling system. Refer to CO-10, "
Changing Engine Coolant" (QR engine) or CO-34,
"Changing Engine Coolant" (VQ engine).
3. Remove extension cowl top lower panel. Refer to EI-21, "
COWL TOP" .
4. Disconnect low-pressure pipe 1 and high-pressure pipe 1 from
evaporator.
a. Set a disconnector [high-pressure side (SST: 9253089908), low-
pressure side (SST: 9253089916)] on A/C piping.
b. Slide a disconnector toward vehicle front until it clicks.
c. Slide A/C piping toward vehicle front and disconnect it.
CAUTION:
Cap or wrap the joint of the pipe with suitable material such
as vinyl tape to avoid the entry of air.
5. Disconnect two heater hoses from heater core.
6. Remove instrument panel assembly. Refer to IP-10, "
INSTRUMENT PANEL ASSEMBLY" .
7. Remove blower unit. Refer to AT C - 11 3 , "
BLOWER UNIT" .
8. Remove drain hose.
9. Remove mounting nuts, and then remove instrument stays.
RJIA3300E
RJIA3301E
RJIA3302E

ATC-120
HEATER & COOLING UNIT ASSEMBLY

10. Remove mounting bolts from heater & cooling unit.
11. Remove steering column mounting nuts.
12. Remove steering member mounting bolts.
13. Remove steering member, and then remove heater & cooling unit.
INSTALLATION
Installation is basically the reverse order of removal.
CAUTION:

Replace O-rings of A/C piping with new ones, and then apply compressor oil to it when installing
it.

Female-side piping connection is thin and easy to deform. Slowly insert the male-side piping
straight in axial direction.

Insert piping securely until a click is heard.

After piping connection is completed, pull male-side piping by hand to make sure that connection
does not come loose.

When recharging refrigerant, check for leaks.
NOTE:

When filling radiator with coolant, refer to CO-10, "Changing Engine Coolant" (QR engine) or CO-34,
"Changing Engine Coolant" (VQ engine).

Recharge the refrigerant.
RJIA3303E
RJIA3304E

HEATER & COOLING UNIT ASSEMBLY
ATC-121
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Disassembly and AssemblyBJS000HI
1. Adaptor duct 2. Heater & cooling case (left) 3. Mode door motor bracket
4. Mode door motor 5. Instrument lower cover bracket 6. Aspirator
7. Aspirator duct 8. Sub harness 9. Heater core
10. Foot duct (right) 11. Heater core cover 12. Air mix door motor (passenger side)
13. Evaporator cover 14. Bolt 15. Low-pressure pipe 2
16. High-pressure pipe 2 17. Cooler pipe grommet 18. Heater & cooling case (right)
19. Insulator 20. Air mix door motor (driver side) 21. Defroster door lever
22. Max. cool door lever 23. Main link 24. Ventilator door lever
25. Ventilator door link 26. Foot duct (left) 27. Ventilator door
28. Heater pipe support 29. Intake sensor 30. Intake sensor bracket
31. Adaptor cover 32. O-ring 33. Expansion valve
34. Evaporator 35. Defroster door 36. Defroster door link
SJIA1657E

ATC-122
HEATER & COOLING UNIT ASSEMBLY

37. Max. cool door link 38. Max. cool door (left) 39. Center case
40. Heater pipe grommet 41. Air mix door 42. Max. cool door (right)
: N·m (kg-m, in-lb)
: Always replace after every disassembly

HEATER CORE
ATC-125
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HEATER COREPFP:27140
Removal and InstallationBJS000HL
REMOVAL
1. Set the temperature (passenger side) at 18°C, and then disconnect the battery cable from the negative
terminal.
2. Remove heater & cooling unit assembly. Refer to AT C - 11 9 , "
HEATER & COOLING UNIT ASSEMBLY" .
3. Remove mounting screws, and then remove air mix door motor
(passenger side).
4. Disconnect air mix door motor connector.
5. Remove mounting screws, and then remove foot duct (right).
6. Remove mounting screws, and then remove heater core cover.
7. Remove heater pipe support and heater pipe grommet.
8. Slide heater core (shown in the figure) to rightward.
INSTALLATION
Installation is basically the reverse order of removal.
RJIA3308E
1. Heater & cooling unit 2. Heater core cover 3. Foot duct (right)
4. Screw 5. Heater core 6. Air mix door motor (passenger side)
7. Heater pipe grommet 8. Heater pipe support
SJIA0992E