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VENTILATION, HEATER & AIR CONDITIONER

HEATER & AIR CONDITIONING SYSTEM
SECTION HA B

E
CONTENTS
BASIC INSPECTION ................................... 3
. WITH MONOCHROME DISPLAY .............................17 . F
WITH MONOCHROME DISPLAY : Trouble Diag-
DIAGNOSIS AND REPAIR WORK FLOW ........ 3
. noses for Abnormal Pressure .................................17 .
WITH MONOCHROME DISPLAY : Symptom Ma- G
WITH COLOR DISPLAY ............................................ 3
. trix Chart .................................................................20
.
WITH COLOR DISPLAY : How to Perform Trouble
Diagnosis For Quick And Accurate Repair ............... 3
. PRECAUTION ............................................. 21
.
H
WITH MONOCHROME DISPLAY .............................. 3 . PRECAUTIONS ................................................. 21
WITH MONOCHROME DISPLAY : How to Per- Precaution for Supplemental Restraint System
form Trouble Diagnosis For Quick And Accurate (SRS) "AIR BAG" and "SEAT BELT PRE-TEN- HA
Repair ....................................................................... 3
. SIONER" ................................................................21
.
Precautions Necessary for Steering Wheel Rota-
FUNCTION DIAGNOSIS .............................. 5
.
tion after Battery Disconnect ..................................21 .
J
REFRIGERATION SYSTEM .............................. 5
. Precaution for Procedure without Cowl Top Cover 22 ....
Precautions For Xenon Headlamp Service ............22 .
WITH COLOR DISPLAY ............................................ 5 . Working with HFC-134a (R-134a) ..........................22 .
WITH COLOR DISPLAY : System Diagram ............ 5 . General Refrigerant Precaution ..............................23 . K
WITH COLOR DISPLAY : System Description ........ 5 . Refrigerant Connection ...........................................23.
WITH COLOR DISPLAY : Component Part Loca- Service Equipment .................................................26
.
tion ........................................................................... 6
. L
WITH COLOR DISPLAY : Component Description COMPRESSOR ................................................. 28
...... 8 General Precautions ...............................................28
.

WITH MONOCHROME DISPLAY .............................. 9 . LEAK DETECTION DYE ................................... 29 M
WITH MONOCHROME DISPLAY : System Dia- General Precautions ...............................................29
.
gram ......................................................................... 9
.
WITH MONOCHROME DISPLAY : System De- PREPARATION .......................................... 30
.
N
scription .................................................................... 9
.
PREPARATION ................................................. 30
WITH MONOCHROME DISPLAY : Component
Special Service Tool ...............................................30
.
Part Location .......................................................... 10
.
Commercial Service Tool .......................................32 . O
WITH MONOCHROME DISPLAY : Component
Sealant or/and Oil ...................................................32
.
Description ............................................................. 12
.
ON-VEHICLE MAINTENANCE ................... 34
.
SYMPTOM DIAGNOSIS ............................. 14
. P
REFRIGERANT ................................................. 34
REFRIGERATION SYSTEM SYMPTOMS ........14
.
Collection and Charge ............................................34
.
WITH COLOR DISPLAY .......................................... 14
.
WITH COLOR DISPLAY : Trouble Diagnoses for
OIL ..................................................................... 36
Abnormal Pressure ................................................ 14
. Maintenance of Oil Quantity ...................................36
.
WITH COLOR DISPLAY : Symptom Matrix Chart 16 ....

Revision: October 2008 HA-1 2009 Maxima
Oil Adjusting Procedure for Components Replace- CONDENSER ................................................... 51
.
ment Except Compressor ...................................... 36 .
Oil Adjusting Procedure for Compressor Replace- CONDENSER ........................................................... 51 .
ment ....................................................................... 37
. CONDENSER : Removal and Installation for Con-
denser .................................................................... 51
.
REFRIGERATION SYSTEM ............................. 39
.
Inspection .............................................................. 39
. CONDENSER PIPE ASSEMBLY ............................. 51 .
Performance Chart ................................................ 39 . CONDENSER PIPE ASSEMBLY : Removal and
Checking of Refrigerant Leaks .............................. 40 . Installation for Junction Pipe .................................. 51
.

FLUORESCENT LEAK DETECTOR ................ 41
. REFRIGERANT PRESSURE SENSOR ................... 52 .
REFRIGERANT PRESSURE SENSOR : Remov-
Inspection .............................................................. 41
.
al and Installation for Refrigerant Pressure Sensor
ELECTRICAL LEAK DETECTOR .................... 42
. ... 52
Inspection .............................................................. 42
.
HEATER & COOLING UNIT ASSEMBLY ........ 53
.
ON-VEHICLE REPAIR ............................... 44
. HEATER & COOLING UNIT ASSEMBLY ............... 53 .
COMPRESSOR ................................................ 44
. HEATER & COOLING UNIT ASSEMBLY : Re-
Removal and Installation for Compressor ............. 44
. moval and Installation ............................................ 53
.
Removal and Installation for Compressor Clutch ... 45 HEATER CORE ........................................................ 54
.
COOLER PIPE AND HOSE .............................. 48
. HEATER CORE : Removal and Installation ........... 54 .
Exploded View ....................................................... 48
. EVAPORATOR ......................................................... 55
.
LOW-PRESSURE FLEXIBLE HOSE ....................... 48
. EVAPORATOR : Removal and Installation ............ 55 .
LOW-PRESSURE FLEXIBLE HOSE : Removal EXPANSION VALVE ................................................ 56
.
and Installation for Low-Pressure Flexible Hose ... 48 EXPANSION VALVE : Removal and Installation
for Expansion Valve ............................................... 56
.
LOW-PRESSURE PIPE ........................................... 49
.
LOW-PRESSURE PIPE : Removal and Installa- SERVICE DATA AND SPECIFICATIONS
tion for Low-Pressure Pipe .................................... 49
.
(SDS) .......................................................... 57
HIGH-PRESSURE FLEXIBLE HOSE ...................... 49
.
HIGH-PRESSURE FLEXIBLE HOSE : Removal SERVICE DATA AND SPECIFICATIONS
and Installation for High-Pressure Flexible Hose ... 49 (SDS) ................................................................ 57
.
Compressor ........................................................... 57 .
HIGH-PRESSURE PIPE ........................................... 50
. Oil ........................................................................... 57
.
HIGH-PRESSURE PIPE : Removal and Installa- Refrigerant ............................................................. 57.
tion for High-Pressure Pipe ................................... 50
.

Revision: October 2008 HA-2 2009 Maxima
DIAGNOSIS AND REPAIR WORK FLOW
< BASIC INSPECTION >
BASIC INSPECTION A
DIAGNOSIS AND REPAIR WORK FLOW
WITH COLOR DISPLAY
B
WITH COLOR DISPLAY : How to Perform Trouble Diagnosis For Quick And Accurate
Repair INFOID:0000000004335598

C
WORK FLOW
1.LISTEN TO CUSTOMER COMPLAINT D
Interview the customer to obtain as much information as possible about the conditions and environment under
which the symptom occurs.
E
>> GO TO 2.
2.CHECK FOR SERVICE BULLETINS
F
Check for any service bulletins.

>> GO TO 3. G
3.CHECK FOR HVAC DTCS WITH CONSULT-III
Using CONSULT-III, perform "SELF-DIAGNOSIS RESULTS" of HVAC. Refer to HAC-96, "DTC Index".
H
Are there any HVAC DTCs present?
YES >> Go to HVAC DTC index. Refer to HAC-96, "DTC Index".
NO >> GO TO 4.
HA
4.CHECK FOR AUDIO DTCS WITH CONSULT-III
Using CONSULT-III, perform "SELF-DIAGNOSIS RESULTS" of MULTI AV. Refer to HAC-96, "DTC Index".
Are there any audio DTCs present? J
YES >> Go to audio DTC index. Refer to HAC-96, "DTC Index".
NO >> GO TO 5.
5.PERFORM OPERATIONAL CHECK K

Verify the symptom with operational check based on the information obtained from the customer. Refer to
HAC-5, "Operational Check (Front)" and HAC-6, "Operational Check (Rear)".
L

>> GO TO 6.
6.GO TO APPROPRIATE TROUBLE DIAGNOSIS M
Go to appropriate trouble diagnosis. Refer to HA-16, "WITH COLOR DISPLAY : Symptom Matrix Chart".
NOTE:
If DTC is displayed, erase DTC after repairing or replacing malfunctioning parts. N
Can a symptom be duplicated?
YES >> Repair or replace malfunctioning parts.
NO >> GO TO 7. O
7.FINAL CHECK
Check that the A/C system operates normally. P
Is the inspection result normal?
YES >> Inspection End
NO >> GO TO 3.
WITH MONOCHROME DISPLAY
WITH MONOCHROME DISPLAY : How to Perform Trouble Diagnosis For Quick And

Revision: October 2008 HA-3 2009 Maxima
DIAGNOSIS AND REPAIR WORK FLOW
< BASIC INSPECTION >
Accurate Repair INFOID:0000000004392471

WORK FLOW
1.LISTEN TO CUSTOMER COMPLAINT
Interview the customer to obtain as much information as possible about the conditions and environment under
which the symptom occurs.

>> GO TO 2.
2.CHECK FOR SERVICE BULLETINS
Check for any service bulletins.

>> GO TO 3.
3.CHECK FOR HVAC DTCS WITH CONSULT-III
Using CONSULT-III, perform "SELF-DIAGNOSIS RESULTS" of HVAC. Refer to HAC-204, "DTC Index".
Are there any HVAC DTCs present?
YES >> Go to HVAC DTC index. Refer to HAC-204, "DTC Index".
NO >> GO TO 4.
4.PERFORM OPERATIONAL CHECK
Verify the symptom with operational check based on the information obtained from the customer. Refer to
HAC-131, "Operational Check".

>> GO TO 5.
5.GO TO APPROPRIATE TROUBLE DIAGNOSIS
Go to appropriate trouble diagnosis. Refer to HA-20, "WITH MONOCHROME DISPLAY : Symptom Matrix
Chart".
NOTE:
If DTC is displayed, erase DTC after repairing or replacing malfunctioning parts.
Can a symptom be duplicated?
YES >> Repair or replace malfunctioning parts.
NO >> GO TO 6.
6.FINAL CHECK
Check that the A/C system operates normally.
Is the inspection result normal?
YES >> Inspection End
NO >> GO TO 3.

Revision: October 2008 HA-4 2009 Maxima
REFRIGERATION SYSTEM
< FUNCTION DIAGNOSIS >
FUNCTION DIAGNOSIS A
REFRIGERATION SYSTEM
WITH COLOR DISPLAY
B
WITH COLOR DISPLAY : System Diagram INFOID:0000000003897363

J
AWIIA0054ZZ

1. Electric compressor 2. Pressure relief valve 3. Liquid tank K
4. Refrigerant pressure sensor 5. Condenser 6. Expansion valve
7. Evaporator 8. Blower motor A. High-pressure gas
B. High-pressure liquid C. Low-pressure liquid D. Low-pressure gas L
E. Suction port F. Discharge port G Outside air

WITH COLOR DISPLAY : System Description INFOID:0000000003897362
M

REFRIGERANT FLOW
The refrigerant flows in the standard pattern, that is, through the compressor, the condenser with liquid tank,
N
through the evaporator, and back to the compressor. The refrigerant evaporation through the evaporator coil is
controlled by an externally equalized expansion valve, located inside the evaporator case.
REFRIGERANT PRESSURE SENSOR O
The refrigerant system is protected against excessively high or low pressures by the refrigerant pressure sen-
sor, located on the liquid tank attached to the condenser. If the system pressure rises above or falls below the
specifications, the refrigerant pressure sensor detects the pressure inside the refrigerant line and sends the
voltage signal to the ECM. The ECM then ceases to supply power to the A/C relay which disengages and P
stops the compressor when pressure on the high pressure side (as detected by refrigerant pressure sensor) is
over approximately 2,746 kPa (28 kg/cm2, 398 psi), or below approximately 120 kPa (1.22 kg/cm2, 17.4 psi).
PRESSURE RELIEF VALVE
The refrigerant system is also protected by a pressure relief valve, located in the rear head of the compressor.
When the pressure of refrigerant in the system increases to an abnormal level [more than 3,600 kPa (36.7 kg/

Revision: October 2008 HA-5 2009 Maxima
REFRIGERATION SYSTEM
< FUNCTION DIAGNOSIS >
cm2, 522 psi)], the release port on the pressure relief valve automatically opens and releases refrigerant into
the atmosphere.
WITH COLOR DISPLAY : Component Part Location INFOID:0000000004335599

ENGINE COMPARTMENT

AWIIA1048ZZ

1. A/C compressor F3 2. Ambient Sensor E211 3. Refrigerant pressure sensor E219

Revision: October 2008 HA-6 2009 Maxima
REFRIGERATION SYSTEM
< FUNCTION DIAGNOSIS >

A
PASSENGER COMPARTMENT

O
AWIIA1049ZZ

1. Sun load sensor M56 2. Rear control cancel switch M89 3. In-vehicle sensor M34
P
4. A/V and AV switch assembly M98 5. Intake sensor M69 6. Evaporator
7. Air mix door motor (passenger side) 8. Blower motor 9. Intake door motor
10. Mode door motor 11. Air mix door motor (driver side)

Revision: October 2008 HA-7 2009 Maxima
REFRIGERATION SYSTEM
< FUNCTION DIAGNOSIS >

REAR PASSENGER COMPARTMENT

AWIIA1050GB

1. Rear control switch B402, B404 2. Display 3. AUTO switch (rear)
4. Blower control switch (rear) 5. Temperature control (rear)

WITH COLOR DISPLAY : Component Description INFOID:0000000004335600

Component Reference
Refrigerant pressure sensor EC-481, "Description"
A/C compressor HAC-60, "Description"
Ambient sensor HAC-33, "Description"
Intake door motor HAC-51, "Description"
Air mix door motor (driver side) HAC-45, "Description"

Revision: October 2008 HA-8 2009 Maxima
REFRIGERATION SYSTEM
< FUNCTION DIAGNOSIS >
Component Reference
A
Air mix door motor (passenger side) HAC-47, "Description"
Mode door motor HAC-49, "Description"
Sunload sensor HAC-42, "Description" B
In-vehicle sensor HAC-36, "Description"
A/C auto amp. HAC-63, "A/C AUTO AMP. : Description"
Intake sensor HAC-39, "Description" C
Blower motor HAC-53, "Description"

WITH MONOCHROME DISPLAY D

WITH MONOCHROME DISPLAY : System Diagram INFOID:0000000004392518

AWIIA0054ZZ

M
1. Electric compressor 2. Pressure relief valve 3. Liquid tank
4. Refrigerant pressure sensor 5. Condenser 6. Expansion valve
7. Evaporator 8. Blower motor A. High-pressure gas
N
B. High-pressure liquid C. Low-pressure liquid D. Low-pressure gas
E. Suction port F. Discharge port G Outside air

WITH MONOCHROME DISPLAY : System Description INFOID:0000000004392519 O

REFRIGERANT FLOW
The refrigerant flows in the standard pattern, that is, through the compressor, the condenser with liquid tank, P
through the evaporator, and back to the compressor. The refrigerant evaporation through the evaporator coil is
controlled by an externally equalized expansion valve, located inside the evaporator case.
REFRIGERANT PRESSURE SENSOR
The refrigerant system is protected against excessively high or low pressures by the refrigerant pressure sen-
sor, located on the liquid tank attached to the condenser. If the system pressure rises above or falls below the
specifications, the refrigerant pressure sensor detects the pressure inside the refrigerant line and sends the

Revision: October 2008 HA-9 2009 Maxima
REFRIGERATION SYSTEM
< FUNCTION DIAGNOSIS >
voltage signal to the ECM. The ECM then ceases to supply power to the A/C relay which disengages and
stops the compressor when pressure on the high pressure side (as detected by refrigerant pressure sensor) is
over approximately 2,746 kPa (28 kg/cm2, 398 psi), or below approximately 120 kPa (1.22 kg/cm2, 17.4 psi).
PRESSURE RELIEF VALVE
The refrigerant system is also protected by a pressure relief valve, located in the rear head of the compressor.
When the pressure of refrigerant in the system increases to an abnormal level [more than 3,600 kPa (36.7 kg/
cm2, 522 psi)], the release port on the pressure relief valve automatically opens and releases refrigerant into
the atmosphere.
WITH MONOCHROME DISPLAY : Component Part Location INFOID:0000000004392480

ENGINE COMPARTMENT

Revision: October 2008 HA-10 2009 Maxima
REFRIGERATION SYSTEM
< FUNCTION DIAGNOSIS >

AWIIA1048ZZ

P
1. A/C compressor F3 2. Ambient Sensor E211 3. Refrigerant pressure sensor E219

PASSENGER COMPARTMENT

Revision: October 2008 HA-11 2009 Maxima
REFRIGERATION SYSTEM
< FUNCTION DIAGNOSIS >

AWIIA1112ZZ

1. Sun load sensor M56 2. In-vehicle sensor M34 3. A/C switch assembly M104
4. Intake sensor M69 5. Evaporator 6. Air mix door motor (passenger side)
M129
7. Blower motor M31 8. Intake door motor M126 9. Mode door motor M127
10. Air mix door motor (driver side) M128

WITH MONOCHROME DISPLAY : Component Description INFOID:0000000004392481

Revision: October 2008 HA-12 2009 Maxima
REFRIGERATION SYSTEM
< FUNCTION DIAGNOSIS >
Component Reference
A
Refrigerant pressure sensor EC-481, "Description"
A/C Compressor HAC-182, "Description"
Ambient sensor HAC-158, "Description" B
Intake door motor HAC-176, "Description"
Air mix door motor (driver side) HAC-170, "Description"
Air mix door motor (passenger side) HAC-172, "Description" C
Mode door motor HAC-174, "Description"
Sunload sensor HAC-167, "Description"
D
In-vehicle sensor HAC-161, "Description"
A/C auto amp. HAC-186, "A/C AUTO AMP. : Description"
Intake sensor HAC-164, "Description" E
Blower motor HAC-178, "Description"

Revision: October 2008 HA-13 2009 Maxima
REFRIGERATION SYSTEM SYMPTOMS
< SYMPTOM DIAGNOSIS >
SYMPTOM DIAGNOSIS
REFRIGERATION SYSTEM SYMPTOMS
WITH COLOR DISPLAY
WITH COLOR DISPLAY : Trouble Diagnoses for Abnormal Pressure INFOID:0000000004335601

Whenever systems high and/or low side pressure is abnormal, diagnose using a manifold gauge. The marker
above the gauge scale in the following tables indicates the standard (usual) pressure range. Since the stan-
dard (usual) pressure, however, differs from vehicle to vehicle, refer to above table (Ambient air temperature-
to-operating pressure table).
Both High- and Low-pressure Sides are Too High

Gauge indication Refrigerant cycle Probable cause Corrective action
Pressure is reduced soon af-
Excessive refrigerant charge in Reduce refrigerant until speci-
ter water is splashed on con-
refrigeration cycle fied pressure is obtained.
denser.
Insufficient condenser cooling
performance

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