cooling NISSAN TEANA 2014 Service Manual

HEATING AND COOLING UNIT ASSEMBLYHA-41
< REMOVAL AND INSTALLATION >
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HEATING AND COOLING UNIT ASSEMB LY : Removal and InstallationINFOID:0000000009463949
REMOVAL
1. Discharge the refrigerant. Refer to HA-23, "Recycle Refrigerant".
2. Drain the cooling system. Refer to CO-12, "Changing Engine Coolant"
.
3. Remove the instrument panel assembly. Refer to IP-15, "Removal and Installation"
.
4. Remove the steering column. Refer to ST-33, "Removal and Installation"
.
5. Remove the strut tower brace. Refer to FSU-19, "Exploded View"
.
6. Disconnect the low-pressure pipe from the expansion valve. CAUTION:
Cap or wrap the joint of the pipe with suitable ma terial such as vinyl tape to avoid the entry of air.
7. Disconnect the high-pressure pi pe from the expansion valve.
8. Disconnect the heater hoses from the heater core pipes.
9. Remove the steering member cover (A) and bolt (B). NOTE:
The steering member cover (A) and bolt (B) can be found near
the cowl area in the engine compartment.
10. Remove the remaining steering member bolts.
11. Disconnect the harness connectors from the heati ng and cooling unit assembly and steering member.
12. Remove the heating and cooling unit assembly and steering member as one assembly from the vehicle.
13. Seperate the heating and cooling unit assembly from the steering member.
INSTALLATION
Installation is in the reverse order of removal.
CAUTION:
After charging refrigerant, check for leaks. Refer to HA-21, "Leak Test"
.
HEATER CORE
1. Heating and cooling unit assembly 2. Steering member Front
ALIIA0624ZZ
ALIIA0623ZZ
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HA-42
< REMOVAL AND INSTALLATION >
HEATING AND COOLING UNIT ASSEMBLY
HEATER CORE : Removal and Installation
INFOID:0000000009463950
REMOVAL
1. Remove the heating and cooling unit assembly. Refer to HA-41, "HEATING AND COOLING UNIT
ASSEMBLY : Removal and Installation".
2. Remove the heater core pipes cover. Refer to HA-40, "Exploded View"
.
3. Disconnect the harness connector from the blower motor.
4. Remove the heater core.
INSTALLATION
Installation is in the reverse order of removal.
EVAPORATOR
EVAPORATOR : Removal and InstallationINFOID:0000000009463951
REMOVAL
1. Remove the heater core. Refer to HA-42, "HEATER CORE : Removal and Installation".
2. Remove the upper floor connecting duct (RH). Refer to HA-40, "Exploded View"
.
3. Remove the air mix door motor (driver). Refer to HAC-109, "AIR MIX DOOR MOTOR : Removal and
Installation - Air Mix Door Motor (RH)".
4. Remove the air mix door motor (passenger) (if equipped). Refer to HAC-109, "AIR MIX DOOR MOTOR :
Removal and Installation - Air Mix Door Motor (LH)"
5. Disconnect the harness connector from the intake sensor.
6. Remove the evaporator and expansion valve assembly.
INSTALLATION
Installation is in the reverse order of removal.
NOTE:
The evaporator can only be ordered as an assembly with the expansion valve.
EXPANSION VALVE
EXPANSION VALVE : Removal and Installation for Expansion ValveINFOID:0000000009463952
REMOVAL
1. Discharge the refrigerant. Refer to HA-23, "Recycle Refrigerant".
2. Remove the strut tower brace. Refer to FSU-19, "Exploded View"
.
3. Disconnect the low-pressure pipe from the expansion valve.
4. Disconnect the high-pressure pipe from the expansion valve.
5. Remove the expansion valve bolts.
6. Remove the expansion valve.
INSTALLATION
Installation is in the reverse order of removal.
CAUTION:
After charging refrigerant, check for leaks. Refer to HA-21, "Leak Test"
.
Revision: November 20132014 Altima NAM

HAC-2
Diagnosis Procedure ..............................................55
U1010 CONTROL UNIT (CAN) .........................56
Description ........................................................... ...56
DTC Logic ...............................................................56
Diagnosis Procedure ..............................................56
B2578, B2579 IN-VEHICLE SENSOR ...............57
DTC Logic ............................................................ ...57
Diagnosis Procedure ..............................................57
Component Inspection ............................................58
B257B, B257C AMBIENT SENSOR .................60
DTC Logic ............................................................ ...60
Diagnosis Procedure ..............................................60
Component Inspection ............................................61
B2581, B2582 INTAKE SENSOR ......................63
DTC Logic ............................................................ ...63
Diagnosis Procedure ..............................................63
Component Inspection ............................................64
B2630, B2631 SUNLOAD SENSOR .................66
DTC Logic ............................................................ ...66
Diagnosis Procedure ..............................................66
Component Inspection ............................................67
B2632, B2633 AIR MIX DOOR MOTOR
(DRIVER SIDE) ............................................... ...
69
DTC Logic ............................................................ ...69
Diagnosis Procedure ..............................................69
B2634, B2635 AIR MIX DOOR MOTOR (PAS-
SENGER SIDE) ............................................... ...
71
DTC Logic ............................................................ ...71
Diagnosis Procedure ..............................................71
B2636, B2637, B2638, B2639, B2654, B2655
MODE DOOR MOTOR ................................... ...
73
DTC Logic ............................................................ ...73
Diagnosis Procedure ..............................................73
B263D, B263E, B263F INTAKE DOOR MO-
TOR ................................................................. ...
75
DTC Logic ............................................................ ...75
Diagnosis Procedure ..............................................75
B27B0 A/C AUTO AMP. ....................................77
DTC Logic ............................................................ ...77
Diagnosis Procedure ..............................................77
POWER SUPPLY AND GROUND CIRCUIT .....78
A/C AUTO AMP. .................................................... ...78
A/C AUTO AMP. : Diagnosis Procedure ................78
AIR MIX DOOR MOTOR (DRIVER SIDE) .............. ...78
AIR MIX DOOR MOTOR (DRIVER SIDE) : Diag-
nosis Procedure ................................................... ...
78
AIR MIX DOOR MOTOR (PASSENGER SIDE) ..... ...79
AIR MIX DOOR MOTOR (PASSENGER SIDE) :
Diagnosis Procedure ............................................ ...
79
MODE DOOR MOTOR ........................................... ...80
MODE DOOR MOTOR : Diagnosis Procedure .......80
INTAKE DOOR MOTOR ........................................ ...81
INTAKE DOOR MOTOR : Diagnosis Procedure ....81
A/C SWITCH ASSEMBLY .........................................82
A/C SWITCH ASSEMBLY : Component Function
Check ................................................................... ...
82
A/C SWITCH ASSEMBLY : Diagnosis Procedure ...83
BLOWER MOTOR .......................................... ...84
Diagnosis Procedure ............................................ ...84
Component Inspection (Blower Motor) ...................85
Component Inspection (Front Blower Motor Re-
lay) ....................................................................... ...
85
MAGNET CLUTCH ............................................87
Component Function Check ................................ ...87
Diagnosis Procedure ...............................................87
A/C SWITCH ASSEMBLY SIGNAL CIRCUIT ...88
Diagnosis Procedure ...............................................88
DOOR MOTOR ..................................................89
Diagnosis Procedure ............................................ ...89
DOOR MOTOR COMMUNICATION CIRCUIT ...91
Diagnosis Procedure ............................................ ...91
ECV (ELECTRICAL CONTROL VALVE) ..........92
Diagnosis Procedure ............................................ ...92
Component Inspection ............................................93
SYMPTOM DIAGNOSIS ............................94
HEATER AND AIR CONDITIONING SYSTEM
CONTROL SYMPTOMS ................................. ...
94
Diagnosis Chart By Symptom .............................. ...94
INSUFFICIENT COOLING .................................96
Description ........................................................... ...96
Diagnosis Procedure ...............................................96
INSUFFICIENT HEATING .................................98
Description ........................................................... ...98
Diagnosis Procedure ...............................................98
COMPRESSOR DOES NOT OPERATE ...........99
Description ........................................................... ...99
Diagnosis Procedure ...............................................99
REMOVAL AND INSTALLATION .............101
A/C SWITCH ASSEMBLY .............................. ..101
Removal and Installation .......................................101
A/C AUTO AMP. ............................................. ..102
Exploded View ..................................................... .102
Removal and Installation .......................................102
Revision: November 20132014 Altima NAMRevision: November 20132014 Altima NAM

HAC-4
HEATER AND AIR CONDITIONING SYSTEM
CONTROL SYMPTOMS ................................. .
154
Symptom Table ................................................... ..154
INSUFFICIENT COOLING ...............................155
Component Function Check ................................ ..155
INSUFFICIENT HEATING ...............................157
Component Function Check ................................ ..157
COMPRESSOR DOES NOT OPERATE .........159
Description ........................................................... ..159
Diagnosis Procedure .............................................159
REMOVAL AND INSTALLATION ..............161
FRONT AIR CONTROL .................................. .161
Removal and Installation ..................................... ..161
IN-VEHICLE SENSOR ......................................162
Removal and Installation .......................................162
REFRIGERANT PRESSURE SENSOR ......... ..163
Removal and Installation .......................................163
DOOR MOTOR ............................................... ..164
Exploded View ..................................................... .164
INTAKE DOOR MOTOR ........................................ .165
INTAKE DOOR MOTOR : Removal and Installa-
tion ....................................................................... .
165
MODE DOOR MOTOR ........................................... .165
MODE DOOR MOTOR : Removal and Installation .165
AIR MIX DOOR MOTOR ........................................ .165
AIR MIX DOOR MOTOR : Removal and Installa-
tion ....................................................................... .
165
Revision: November 20132014 Altima NAMRevision: November 20132014 Altima NAM

HAC-14
< SYSTEM DESCRIPTION >[AUTOMATIC AIR CONDITIONER]
SYSTEM
-
HAC-16, "Compressor Control"
-HAC-17, "Door Control"
-HAC-20, "Temperature Control"
- Correction for input value of each sensor
Ambient sensor (setting temperature correction)• A/C auto amp. controls passenger r oom temperature so that the optimum level always matches the temper-
ature level that the passenger may feel. Correction is appl ied to the target temperature that is set using tem-
perature control dial, according to ambient temperature detected by ambient sensor.
In-vehicle sensor [in-vehicle temperature correction]• Passenger room temperature detected by in-vehicle s ensor is corrected for each front air conditioning con-
trol (driver side and passenger side).
Intake sensor (intake temperature correction)• A/C auto amp. performs correction to change recogniti on intake temperature of A/C auto amp. quickly when
difference is large between recognition intake temperat ure and intake temperature detected by intake tem-
perature sensor. The correction is performed to change recognition intake temperature slowly when differ-
ence is small.
Sunload sensor (sunload amount correction)
• Sunload amount detected by sunload sensor is corrected for each air conditioning control.
• A/C auto amp. performs correction to change recogni tion sunload amount of A/C auto amp. slowly when
sunload amount changes quickly, for example when entering or exiting a tunnel.
Control by ECM- Cooling fan control Refer to EC-59, "COOLING FAN CONTROL : System De scription (with automatic air conditioner)"
(QR25DE) or EC-575, "COOLING FAN CONTRO L : System Description" (VQ35DE).
- Air conditioning cut control
Refer to EC-59, "COOLING FAN CONTROL : System De scription (with automatic air conditioner)"
(QR25DE) or EC-573, "AIR CONDITIONING CUT CONTROL : System Description" (VQ35DE).
Control by IPDM E/R- Relay control
Refer to PCS-6, "RELAY CONTROL SYSTEM : System Description"
.
- Cooling fan control
Refer to EC-59, "COOLING FAN CONTROL : System De scription (with automatic air conditioner)"
(QR25DE) or EC-575, "COOLING FAN CONTRO L : System Description" (VQ35DE).
Control by BCM- Relay control
Refer to BCS-7, "BODY CONTROL SYST EM : System Description"
.
Air Flow ControlINFOID:0000000009463095
DESCRIPTION
• A/C auto amp. changes duty ratio of blower motor dr ive signal and controls air flow continuously. When air
flow is increased, duty ratio of blower motor contro l signal gradually increases to prevent a sudden increase
in air flow.
• In addition to manual control and automatic control, air fl ow control consists of starting fan speed control, low
coolant temperature starting control, high in-vehicl e temperature starting control and fan speed control at
door motor operation
AUTOMATIC AIR FLOW CONTROL
• A/C auto amp. decides target air flow depending on target air mix door opening angle.
• A/C auto amp. changes duty ratio of blower motor c ontrol signal and controls the air flow continuously so
that air flow matches the target air flow.
Revision: November 20132014 Altima NAMRevision: November 20132014 Altima NAM

OPERATION INSPECTIONHAC-49
< BASIC INSPECTION > [AUTOMATIC AIR CONDITIONER]
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YES >> GO TO 6.
NO >> Check magnet clutch system. Refer to HAC-87, "Diagnosis Procedure"
.
6.CHECK TEMPERATURE DECREASE
1. Operate the A/C compressor.
2. Operate the temperature control switch (drive r side) and lower the temperature setting to 18°C (60 °F).
3. Check that the cool air blows from the outlets.
Is the inspection result normal?
YES >> GO TO 7.
NO >> Check for insufficient cooling. Refer to HAC-96, "Diagnosis Procedure"
.
7.CHECK TEMPERATURE INCREASE
1. Operate the temperature control switch (drive r side) and raise the temperature setting to 32°C (90 °F) after
warming up the engine.
2. Check that the warm air blows from the outlets.
Is the inspection result normal?
YES >> GO TO 8.
NO >> Check for insufficient heating. Refer to HAC-98, "Diagnosis Procedure"
.
8.CHECK DUAL MODE FUNCTION
1. Press the DUAL mode switch, and then check that “DUAL” is shown on the display.
2. Operate the temperature control switch (driver si de). Check that the discharge air temperature (driver
side) changes.
3. Operate the temperature control switch (passenger side). Check that the discharge air temperature (pas-
senger side) changes.
4. Press the DUAL mode switch, and then check that the temperature setting (driver/passenger) is unified to
the driver side temperature setting.
Is the inspection result normal?
YES >> GO TO 9.
NO >> Refer to HAC-94, "Diagnosis Chart By Symptom"
and perform the appropriate diagnosis.
9.CHECK AUTO MODE
1. Press the AUTO switch, and then check t hat “AUTO” is shown on the display.
2. Operate the temperature control switch (driver side) . Check that the fan speed, outlet air or intake air
changes. The discharge air temperature or fan speed varies depending on the ambient temperature, in-
vehicle temperature, and temperature setting.
Is the inspection result normal?
YES >> Inspection End
NO >> Refer to HAC-94, "Diagnosis Chart By Symptom"
and perform the appropriate diagnosis.
Revision: November 20132014 Altima NAMRevision: November 20132014 Altima NAM

HEATER AND AIR CONDITIONING SYSTEM CONTROL SYMPTOMS
HAC-95
< SYMPTOM DIAGNOSIS > [AUTOMATIC AIR CONDITIONER]
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• Insufficient cooling.
• No cool air comes out. (Air flow volume is normal.) • Magnet clutch control system
• Drive belt slipping
• Refrigerant cycle
• ECV (electrical control valve)
• Air leakage from each duct
• A/C auto amp. connection recogni- tion signal circuit
• Temperature setting trimmer (front)HAC-96, "Diagnosis Procedure"
• Insufficient heating.
• No warm air comes out. (Air flow volume is nor- mal.) • Engine cooling system
• Heater hose
• Heater core
• Air leakage from each duct
• Temperature setting trimmer (front)HAC-98, "Diagnosis Procedure"
Noise is heard when front
air conditioning system op-
erates. During compressor
operation Refrigerant cycle
HA-18, "Symptom Table"
During front blower
motor operation • Mixing any foreign object in front
blower motor
• Front blower motor fan breakage
• Front blower motor rotation inferiori-
ty HAC-85, "Component Inspection
(Blower Motor)"
• Memory function does not operate.
• Setting temperature is not memorized. • Battery power supply system of A/C
auto amp.
• A/C auto amp. HAC-78, "A/C AUTO AMP. : Diag-
nosis Procedure"
Symptom Corresponding malfunction part Reference
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HAC-96
< SYMPTOM DIAGNOSIS >[AUTOMATIC AIR CONDITIONER]
INSUFFICIENT COOLING
INSUFFICIENT COOLING
DescriptionINFOID:0000000009463167
Symptom
• Insufficient cooling
• No cool air comes out. (Air flow volume is normal.)
Diagnosis ProcedureINFOID:0000000009463168
NOTE:
Perform self-diagnoses with CONSULT before performi ng symptom diagnosis. If any DTC is detected, per-
form the corresponding diagnosis.
1.CHECK MAGNET CLUTCH OPERATION
1. Turn ignition switch ON.
2. Operate fan switch.
3. Press A/C switch.
4. Check that A/C indicator turns ON. Check visually and by sound that compressor operates.
5. Press A/C switch again.
6. Check that A/C indicator turns OFF. Check that compressor stops.
Is the inspection result normal?
YES >> GO TO 2.
NO >> Perform diagnosis of “COMPRESSOR DOES NOT OPERATE” in “SYMPTOM DIAGNOSIS”.
Refer to HAC-99, "Diagnosis Procedure"
.
2.CHECK DRIVE BELT
Check tension of drive belt. Refer to EM-19, "Checking Drive Belts"
(QR25DE) or EM-134, "Checking Drive
Belts" (VQ35DE).
Is the inspection result normal?
YES >> GO TO 3.
NO >> Adjust or replace drive belt depending on the inspection results.
3.CHECK REFRIGERANT CYCLE
Connect recovery/recycling recharging equipment to the vehicle and perform pressure inspection with gauge.
Refer to HA-18, "Symptom Table"
.
Is the inspection result normal?
YES >> GO TO 4.
NO >> Repair or replace parts depending on the inspection results.
4.CHECK AIR LEAKAGE FROM EACH DUCT
Check duct and nozzle, etc. of the fr ont air conditioning system for leakage.
Is the inspection result normal?
YES >> GO TO 5.
NO >> Repair or replace parts depending on the inspection results.
5.CHECK AMBIENT TEMPERATURE DISPLAY
Check that there is not much difference between act ual ambient temperature and indicated temperature on
information display in combination meter.
Is the inspection result normal?
YES >> GO TO 6.
NO >> Perform diagnosis for the A/C auto amp. connection recognition signal circuit. Refer to HAC-60,
"Diagnosis Procedure".
6.CHECK SETTING OF TEMPERATURE SETTING TRIMMER (FRONT)
1. Check setting value of temperature setting trimmer (front). Refer to HAC-50, "Temperature Setting Trim-
mer".
2. Check that temperature setting trimme r (front) is set to “+ direction”.
Revision: November 20132014 Altima NAMRevision: November 20132014 Altima NAM

INSUFFICIENT COOLINGHAC-97
< SYMPTOM DIAGNOSIS > [AUTOMATIC AIR CONDITIONER]
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NOTE:
The control temperature can be set with the setti ng of the temperature setting trimmer (front).
3. Set difference between set temperature and control temperature to “0”.
Is inspection result normal?
YES >> Inspection End.
NO >> Replace A/C auto amp. Refer to HAC-102, "Removal and Installation"
.
Revision: November 20132014 Altima NAMRevision: November 20132014 Altima NAM

HAC-98
< SYMPTOM DIAGNOSIS >[AUTOMATIC AIR CONDITIONER]
INSUFFICIENT HEATING
INSUFFICIENT HEATING
DescriptionINFOID:0000000009463169
Symptom
• Insufficient heating
• No warm air comes out. (Air flow volume is normal.)
Diagnosis ProcedureINFOID:0000000009463170
NOTE:
Perform self-diagnosis with CONSULT before performing symptom diagnosis. If DTC is detected, perform the
corresponding diagnosis.
1.CHECK COOLING SYSTEM
1. Check engine coolant level and check leakage. Refer to CO-11, "System Inspection"
(QR25DE) or CO-
35, "System Inspection" (VQ35DE).
2. Check reservoir tank cap. Refer to CO-11, "System Inspection"
(QR25DE) or CO-35, "System Inspection"
(VQ35DE).
3. Check water flow sounds of the engine coolant. Refer to CO-11, "System Inspection"
(QR25DE) or CO-
35, "System Inspection" (VQ35DE).
Is the inspection result normal?
YES >> GO TO 2.
NO >> Refill engine coolant and repair or repl ace parts depending on the inspection results.
2.CHECK HEATER HOSE
Check installation of heater hose visually or by touching.
Is the inspection result normal?
YES >> GO TO 3.
NO >> Repair or replace parts depending on the inspection results.
3.CHECK HEATER CORE
1. Check temperature of inlet hose and outlet hose of front heater core.
2. Check that inlet side of heater core is hot and the outle t side is slightly lower than/almost equal to the inlet
side.
CAUTION:
Always perform the temperature in spection in a short period of time because the engine coolant
temperature is very hot.
Is the inspection result normal?
YES >> GO TO 4.
NO >> Replace heater core. Refer to HA-42, "HEATER CORE : Removal and Installation"
.
4.CHECK AIR LEAKAGE FROM EACH DUCT
Check duct and nozzle, etc. of front air conditioning system for air leakage.
Is the inspection result normal?
YES >> GO TO 5.
NO >> Repair or replace parts depending on the inspection results.
5.CHECK SETTING OF TEMPERATURE SETTING TRIMMER (FRONT)
1. Check setting value of temperature setting trimmer (front). Refer to HAC-50, "Temperature Setting Trim-
mer".
2. Check that temperature setting trimmer (front) is set to “ − direction”.
NOTE:
The control temperature can be set by t he temperature setting trimmer (front).
3. Set difference between the set temperature and control temperature to “0”.
Are the symptoms solved?
YES >> Inspection End.
NO >> Replace A/C auto amp. Refer to HAC-102, "Removal and Installation"
.
Revision: November 20132014 Altima NAMRevision: November 20132014 Altima NAM