2014 NISSAN TEANA heating

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
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

HAC-106
< REMOVAL AND INSTALLATION >[AUTOMATIC AIR CONDITIONER]
INTAKE SENSOR
INTAKE SENSOR
Removal and InstallationINFOID:0000000009463179
The intake sensor is not available separately and must be replaced with the heating and cooling unit as an
assembly. Refer to HA-41, "HEATING AND COOLING UNIT ASSEMBLY : Removal and Installation"
.
Revision: November 20132014 Altima NAMRevision: November 20132014 Altima NAM

HAC-108
< REMOVAL AND INSTALLATION >[AUTOMATIC AIR CONDITIONER]
DOOR MOTOR
DOOR MOTOR
Exploded ViewINFOID:0000000009463181
1. Front heating and cooling unit assembly 2. Mode door motor 3. Air mix door motor (LH)
4. Air mix door motor (RH) 5. Intake door motor
ALIIA0591ZZ
Revision: November 20132014 Altima NAMRevision: November 20132014 Altima NAM

COMPONENT PARTSHAC-115
< SYSTEM DESCRIPTION > [MANUAL AIR CONDITIONER]
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Component DescriptionINFOID:0000000009463193
7. Refrigerant pressure sensor (view with front bumper fascia removed) 8. Blower motor (view with front air con-
ditioning assembly removed from ve-
hicle) 9. Intake door motor
10. Mode door motor 11. Air mix door motor
Component Description
A/C Compressor Vaporized refrigerant is drawn into the A/C compressor from the evaporator, where it is compressed
to a high pressure, high temperature vapor. The hot, compressed vapor is then discharged to the con-
denser.
Air mix door motor The air mix door controls the mix of hot or cold air that enters the ventilation system. It is controlled
by the front air control based on the position of the temperature dial. The air mix door motor receives
position commands from the front air control and reports actual door position back via an LCU (Local
Control Unit) installed inside the motor. Commands and responses are sent across the LIN (Local In-
terconnect Network) to each motor simultaneously, with each motor having its own unique address,
thereby only responding to requests sent to its specific address. The LCU reads the door position from
a Position Balanced Resistor (PBR), also part of the motor, and returns that information to the front
air control. The LCU switches the polarity of the circuits connected to the DC motor to drive the motor
forward or backward as requested by the front air control.
BCM The BCM receives the fan ON and A/C ON signals from the front air control and sends a compressor
ON request to the ECM.
Blower motor The blower motor varies the speed at which the air flows through the ventilation system.
ECM The ECM sends a compressor ON request to the IPDM E/R based on the status of engine operation
and load as well as refrigerant pressure information. If all the conditions are met for A/C operation,
the ECM transmits the compressor ON request to the IPDM E/R. The ECM shares the refrigerant
pressure sensor signal, engine RPM, and engine coolant temperature with the front air control via
CAN communication line.
Front air control The front air control controls the operation of the A/C and heating system based on inputs from the
temperature control knob, the mode switches, the blower control dial, and inputs received from the
ECM and combination meter across the CAN.
Front blower motor relay The front blower motor relay controls the flow of current to fuses 17 and 27 in the Fuse Block (J/B).
The relay is connected directly to ground, and is energized when the ignition switch is in the ON or
START position.
Fuse Block (J/B) Located in the passenger compartment, behind the left lower IP, the Fuse Block (J/B) contains the
front blower motor relay and several fuses required for the air conditioner control system.
Intake door motor The intake door motor controls the position of the intake door. Fresh air is allowed to enter the cabin
in one position, and recirculated inside air is allowed to enter in the other position. At times the front
air control may command partial fresh or recirculation based on evaporator or coolant temperatures.
The intake door motor receives position commands from the front air control and reports actual door
position back via an LCU (Local Control Unit) installed inside the motor. Commands and responses
are sent across the LIN (Local Interconnect Network) to each motor simultaneously, with each motor
having its own unique address, thereby only responding to requests sent to its specific address. The
LCU reads the door position from a Position Balanced Resistor (PBR), also part of the motor, and re-
turns that information to the front air control. The LCU switches the polarity of the circuits connected
to the DC motor to drive the motor forward or backward as requested by the front air control.
IPDM E/R Refer to PCS-6, "RELAY CONTROL SYSTEM : System Description"
.
Revision: November 20132014 Altima NAMRevision: November 20132014 Altima NAM

HAC-154
< SYMPTOM DIAGNOSIS >[MANUAL AIR CONDITIONER]
HEATER AND AIR CONDITIONING
SYSTEM CONTROL SYMPTOMS
SYMPTOM DIAGNOSIS
HEATER AND AIR CONDITIONING SYSTEM CONTROL SYMPTOMS
Symptom TableINFOID:0000000009463222
SYMPTOM TABLE
Symptom Reference Page
A/C system does not come on. Go to Trouble Diagnosis Procedure for A/C System. HAC-152, "Diagno-
sis Procedure"
Air outlet does not change.
Go to Trouble Diagnosis Procedure for Mode Door Motor. (LIN) HAC-142, "Diagno-
sis Procedure"Mode door motor does not operate normally.
Discharge air temperature does not change. Go to Trouble Diagnosis Procedure for Air Mix Door Motor. (LIN) HAC-144, "Diagno-
sis Procedure"Air mix door motor does not operate normal-
ly.
Intake door does not change. Go to Trouble Diagnosis Procedure for Intake Door Motor. (LIN) HAC-146, "Diagno-
sis Procedure"Intake door motor does not operate normally.
Blower motor operation is malfunctioning. Go to Trouble Diagnosis Procedure for Blower Motor. HAC-148, "Diagno-
sis Procedure"
Magnet clutch does not engage. Go to Trouble Diagnosis Procedure for Magnet Clutch.HAC-151, "Diagno-sis Procedure"
Insufficient cooling Go to Trouble Diagnosis Procedure for Insufficient Cooling.HAC-155, "Compo-nent Function
Check"
Insufficient heating Go to Trouble Diagnosis Procedure for Insufficient Heating.HAC-157, "Compo-nent Function
Check"
Noise Go to Trouble Diagnosis Procedure for Noise.
HA-20, "Symptom Table"
Revision: November 20132014 Altima NAMRevision: November 20132014 Altima NAM

INSUFFICIENT HEATINGHAC-157
< SYMPTOM DIAGNOSIS > [MANUAL AIR CONDITIONER]
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INSUFFICIENT HEATING
Component Function CheckINFOID:0000000009463224
SYMPTOM: Insufficient heating
INSPECTION FLOW
1. CONFIRM SYMPTOM BY PERFORMING OP ERATION CHECK - TEMPERATURE INCREASE
1. Turn temperature control dial clockwise to maximum heat.
2. Check for hot air at discharge air outlets.
Can a symptom be duplicated?
YES >> GO TO 3
NO >> GO TO 2
2. CHECK FOR ANY SYMPTOMS
Perform a complete operational check and check for any symptoms. Refer to HAC-140, "Work Procedure"
.
Does another symptom exist?
YES >> Refer to HAC-154, "Symptom Table".
NO >> System OK.
3. CHECK FOR SERVICE BULLETINS
Check for any service bulletins.
>> GO TO 4
4. CHECK ENGINE COOLING SYSTEM
1. Check for proper engine coolant level. Refer to CO-11, "System Inspection"
(QR25DE) or CO-35, "System
Inspection" (VQ35DE).
2. Check hoses for leaks or kinks.
3. Check radiator cap. Refer to CO-11, "System Inspection"
(QR25DE) or CO-35, "System Inspection"
(VQ35DE).
4. Check for air in cooling system.
>> GO TO 5
5. CHECK AIR MIX DOOR MOTOR OPERATION
Check and verify air mix door mechanism for smooth operation.
Does air mix door operate correctly?
YES >> GO TO 6
NO >> Check the air mix door motor circuit. Refer to HAC-144, "Diagnosis Procedure"
.
6. CHECK AIR DUCTS
Check for disconnected or leaking air ducts.
Is the inspection result normal?
YES >> GO TO 7
NO >> Repair all disconnected or leaking air ducts.
7. CHECK HEATER HOSE TEMPERATURES
1. Start engine and warm it up to normal operating temperature.
2. Touch both the inlet and outlet heater hoses. The inlet hose should be hot and the outlet hose should be
warm.
Is the inspection result normal?
YES >> GO TO 8
NO >> Both hoses warm: GO TO 9
8. CHECK ENGINE COOLANT SYSTEM
Revision: November 20132014 Altima NAMRevision: November 20132014 Altima NAM

HAC-158
< SYMPTOM DIAGNOSIS >[MANUAL AIR CONDITIONER]
INSUFFICIENT HEATING
Check thermostat operation. Refer to
CO-22, "Removal and Installation" (QR25DE) or CO-49, "Removal and
Installation" (VQ35DE).
Is the inspection result normal?
YES >> System OK.
NO >> Repair or replace as necessary.
9. CHECK HEATER HOSES
Check heater hoses for proper installation.
Is the inspection result normal?
YES >> System OK.
NO >> 1. Back flush heater core. 2. Drain the water from the system.
3. Refill system with new engine coolant. Refer to CO-12, "Changing Engine Coolant"
(QR25DE) or CO-36, "Changing Engine Coolant" (VQ35DE).
4. To retest GO TO 10
10. CHECK HEATER HOSE TEMPERATURES
1. Start engine and warm up to normal operating temperature.
2. Touch both the inlet and outlet heater hoses. The inlet hose should be hot and the outlet hose should be
warm
Is the inspection result normal?
YES >> System OK.
NO >> Replace heater core. Refer to HA-42, "HEATER CORE : Removal and Installation"
.
Revision: November 20132014 Altima NAMRevision: November 20132014 Altima NAM