Nissan Pathfinder (2009 year). Manual — part 465
INSUFFICIENT COOLING
HAC-115
< SYMPTOM DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
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Both High- and Low-pressure Sides are Too Low
Low-pressure Side Sometimes Becomes Negative
Gauge indication
Refrigerant cycle
Probable cause
Corrective action
High-pressure side is too low and
low-pressure side is too high.
High- and low-pressure sides
become equal soon after com-
pressor operation stops.
Compressor pressure opera-
tion is improper.
↓
Damaged inside compressor
packings.
Replace compressor.
No temperature difference be-
tween high- and low-pressure
sides.
Compressor pressure opera-
tion is improper.
↓
Damaged inside compressor
packings.
Replace compressor.
AC356A
Gauge indication
Refrigerant cycle
Probable cause
Corrective action
Both high- and low-pressure sides
are too low.
• There is a big temperature
difference between liquid
tank outlet and inlet. Outlet
temperature is extremely
low.
• Liquid tank inlet and expan-
sion valve are frosted.
Liquid tank inside is slightly
clogged.
• Replace liquid tank.
• Check oil for contamination.
• Temperature of expansion
valve inlet is extremely low
as compared with areas
near liquid tank.
• Expansion valve inlet may
be frosted.
• Temperature difference oc-
curs somewhere in high-
pressure side.
High-pressure pipe located be-
tween liquid tank and expan-
sion valve is clogged.
• Check and repair malfunc-
tioning parts.
• Check oil for contamination.
Expansion valve and liquid
tank are warm or only cool
when touched.
Low refrigerant charge.
↓
Leaking fittings or compo-
nents.
Check refrigerant system for
leaks. Refer to
ing System for Leaks Using the
Fluorescent Dye Leak Detec-
tor"
.
There is a big temperature dif-
ference between expansion
valve inlet and outlet while the
valve itself is frosted.
Expansion valve closes a little
compared with the specifica-
tion.
↓
1.
Improper expansion
valve adjustment.
2.
Malfunctioning expansion
valve.
3.
Outlet and inlet may be
clogged.
• Remove foreign particles by
using compressed air.
• Check oil for contamination.
An area of the low-pressure
pipe is colder than areas near
the evaporator outlet.
Low-pressure pipe is clogged
or crushed.
• Check and repair malfunc-
tioning parts.
• Check oil for contamination.
Air flow volume is too low.
Evaporator is frozen.
• Check intake sensor circuit.
Refer to
.
• Repair evaporator fins.
• Replace evaporator.
• Refer to
Blower Motor Component
Function Check"
AC353A
2009 Pathfinder
HAC-116
< SYMPTOM DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
INSUFFICIENT COOLING
Low-pressure Side Becomes Negative
Gauge indication
Refrigerant cycle
Probable cause
Corrective action
Low-pressure side sometimes be-
comes negative.
• Air conditioning system does
not function and does not cy-
clically cool the compart-
ment air.
• The system constantly func-
tions for a certain period of
time after compressor is
stopped and restarted.
Refrigerant does not discharge
cyclically.
↓
Moisture is frozen at expan-
sion valve outlet and inlet.
↓
Water is mixed with refrigerant.
• Drain water from refrigerant
or replace refrigerant.
• Replace liquid tank.
AC354A
Gauge indication
Refrigerant cycle
Probable cause
Corrective action
Low-pressure side becomes nega-
tive.
Liquid tank or front/rear side of
expansion valve
′
s pipe is frost-
ed or dewed.
High-pressure side is closed
and refrigerant does not flow.
↓
Expansion valve or liquid tank
is frosted.
Leave the system at rest until
no frost is present. Start it
again to check whether or not
the malfunction is caused by
water or foreign particles.
• If water is the cause, initially
cooling is okay. Then the wa-
ter freezes causing a block-
age. Drain water from
refrigerant or replace refrig-
erant.
• If due to foreign particles, re-
move expansion valve and
remove the particles with dry
and compressed air (not
shop air).
• If either of the above meth-
ods cannot correct the mal-
function, replace expansion
valve.
• Replace liquid tank.
• Check oil for contamination.
AC362A
2009 Pathfinder
INSUFFICIENT HEATING
HAC-117
< SYMPTOM DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
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INSUFFICIENT HEATING
Component Function Check
INFOID:0000000003935942
SYMPTOM: Insufficient heating
INSPECTION FLOW
1.
CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - TEMPERATURE INCREASE
1.
Press the AUTO switch.
2.
Turn the temperature control dial (driver) clockwise until 32
°
C (90
°
F) is displayed.
3.
Check for hot air at discharge air outlets.
Can this symptom be duplicated?
YES
>> GO TO 2.
NO
>> Perform complete system operational check. Refer to
.
2.
CHECK FOR SERVICE BULLETINS
Check for any service bulletins.
>> GO TO 3.
3.
PERFORM SELF-DIAGNOSIS
Perform self-diagnosis. Refer to
HAC-24, "A/C Auto Amp. Self-Diagnosis"
.
Is the inspection results normal?
YES
>> GO TO 4.
NO
>> Refer to
HAC-25, "A/C System Self-Diagnosis Code Chart"
.
4.
CHECK ENGINE COOLING SYSTEM
1.
Check for proper engine coolant level. Refer to
(VK56DE).
2.
Check hoses for leaks or kinks.
3.
Check radiator cap. Refer to
(VQ40DE) or
(VK56DE).
4.
Check for air in cooling system.
>> GO TO 5.
5.
CHECK AIR MIX DOOR OPERATION
Check the operation of the air mix door.
Is the inspection result normal?
YES
>> GO TO 6.
NO
>> Check the air mix door motor circuit. Refer to
HAC-143, "Air Mix Door Motor Component Function
.
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.
Is the inspection result normal?
YES
>> Hot inlet hose and a warm outlet hose: GO TO 8.
NO
>> • Inlet hose cold: GO TO 11.
• Both hoses warm: GO TO 9.
2009 Pathfinder
HAC-118
< SYMPTOM DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
INSUFFICIENT HEATING
8.
CHECK ENGINE COOLANT SYSTEM
Check engine control temperature sensor.
Is the inspection result normal?
YES
>> System OK.
NO
>> Repair or replace as necessary. Retest.
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"
CO-41, "Changing Engine Coolant"
(VK56DE).
4.
GO TO 10 to retest.
10.
CHECK HEATER HOSE TEMPERATURES
1.
Start engine and warm it up to normal operating temperature.
2.
Touch both the inlet and outlet heater hoses.
Is the inspection result normal?
YES
>> System OK.
NO
>> Replace heater core. Refer to
VTL-26, "Removal and Installation"
11.
CHECK HEATER PUMP (VQ40DE ONLY)
Check the operation of the heater pump valve. Refer to
HAC-77, "Component Inspection (VQ40DE)"
.
Is the inspection result normal?
YES
>> System OK.
NO
>> Replace heater pump. Refer to
HA-58, "Removal and Installation"
.
2009 Pathfinder
NOISE
HAC-119
< SYMPTOM DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
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NOISE
Component Function Check
INFOID:0000000003935943
SYMPTOM: Noise
INSPECTION FLOW
AWIIA1001GB
2009 Pathfinder
HAC-120
< SYMPTOM DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
NOISE
*1
HAC-5, "Operational Check (Front)"
and
*2
(VQ40DE) or
*3
*4
VTL-24, "Removal and Installation for
Rear Expansion Valve"
*5
HA-41, "Removal and Installation for
Compressor Clutch"
*6
HA-41, "Removal and Installation for
Compressor Clutch"
*7
HA-40, "Removal and Installation for
Compressor"
*8
HA-27, "Maintenance of Oil Quantity
in Compressor"
*9
HA-54, "Removal and Installation for
Condenser"
2009 Pathfinder
MEMORY FUNCTION DOES NOT OPERATE
HAC-121
< SYMPTOM DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
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MEMORY FUNCTION DOES NOT OPERATE
Memory Function Check
INFOID:0000000003935944
SYMPTOM: Memory function does not operate.
INSPECTION FLOW
1.
CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - MEMORY FUNCTION
1.
Set the temperature to 32
°
C (90
°
F).
2.
Press the OFF switch.
3.
Turn ignition switch OFF.
4.
Turn ignition switch ON.
5.
Press the AUTO switch.
6.
Confirm that the set temperature remains at previous temperature.
7.
Press the OFF switch.
Can the symptom be duplicated?
YES
>> GO TO 3.
NO
>> GO TO 2.
2.
PERFORM COMPLETE OPERATIONAL CHECK
Perform a complete operational check and check for any symptoms. Refer to
.
Can a symptom be duplicated?
YES
>> Refer to
HAC-124, "How to Perform Trouble Diagnosis For Quick And Accurate Repair"
NO
>> System OK.
3.
CHECK FOR SERVICE BULLETINS
Check for any service bulletins.
>> GO TO 4.
4.
PERFORM SELF-DIAGNOSIS
Perform self-diagnosis to check for any codes. Refer to
HAC-24, "A/C Auto Amp. Self-Diagnosis"
Are any self-diagnosis codes present?
YES
>> Refer to
HAC-25, "A/C System Self-Diagnosis Code Chart"
.
NO
>> GO TO 5.
5.
CHECK POWER AND GROUND CIRCUIT
Check main power supply and ground circuit. Refer to
HAC-163, "Front Air Control Component Function
.
Is the inspection result normal?
YES
>> GO TO 6.
NO
>> Repair or replace as necessary.
6.
RECHECK FOR SYMPTOMS
Perform a complete operational check for any symptoms. Refer to
.
Does another symptom exist?
YES
>> Refer to
HAC-124, "How to Perform Trouble Diagnosis For Quick And Accurate Repair"
NO
>> Replace A/C auto amp. Refer to
VTL-7, "Removal and Installation"
.
2009 Pathfinder
HAC-122
< PRECAUTION >
[AUTOMATIC AIR CONDITIONER]
PRECAUTIONS
PRECAUTION
PRECAUTIONS
Supplemental Restraint System (SRS) "AIR BAG" and "SEAT BELT PRE-TENSION-
ER"
INFOID:0000000003935945
The Supplemental Restraint System such as “AIR BAG” and “SEAT BELT PRE-TENSIONER”, used along
with a front seat belt, helps to reduce the risk or severity of injury to the driver and front passenger for certain
types of collision. This system includes seat belt switch inputs and dual stage front air bag modules. The SRS
system uses the seat belt switches to determine the front air bag deployment, and may only deploy one front
air bag, depending on the severity of a collision and whether the front occupants are belted or unbelted.
Information necessary to service the system safely is included in the SR and SB section of this Service Man-
ual.
WARNING:
• To avoid rendering the SRS inoperative, which could increase the risk of personal injury or death in
the event of a collision which would result in air bag inflation, all maintenance must be performed by
an authorized NISSAN/INFINITI dealer.
• Improper maintenance, including incorrect removal and installation of the SRS, can lead to personal
injury caused by unintentional activation of the system. For removal of Spiral Cable and Air Bag
Module, see the SR section.
• Do not use electrical test equipment on any circuit related to the SRS unless instructed to in this
Service Manual. SRS wiring harnesses can be identified by yellow and/or orange harnesses or har-
ness connectors.
Working with HFC-134a (R-134a)
INFOID:0000000003935946
WARNING:
• CFC-12 (R-12) refrigerant and HFC-134a (R-134a) refrigerant are not compatible. If the refrigerants
are mixed compressor failure is likely to occur. Refer to
HA-4, "Contaminated Refrigerant"
. To deter-
mine the purity of HFC-134a (R-134a) in the vehicle and recovery tank, use Refrigerant Recovery/
Recycling Recharging equipment and Refrigerant Identifier.
• Use only specified oil for the HFC-134a (R-134a) A/C system and HFC-134a (R-134a) components. If
oil other than that specified is used, compressor failure is likely to occur.
• The specified HFC-134a (R-134a) oil rapidly absorbs moisture from the atmosphere. The following
handling precautions must be observed:
- When removing refrigerant components from a vehicle, immediately cap (seal) the component to
minimize the entry of moisture from the atmosphere.
- When installing refrigerant components to a vehicle, do not remove the caps (unseal) until just
before connecting the components. Connect all refrigerant loop components as quickly as possible
to minimize the entry of moisture into system.
- Only use the specified oil from a sealed container. Immediately reseal containers of oil. Without
proper sealing, oil will become moisture saturated and should not be used.
- Avoid breathing A/C refrigerant and oil vapor or mist. Exposure may irritate eyes, nose and throat.
Remove HFC-134a (R-134a) from the A/C system using certified service equipment meeting require-
ments of SAE J2210 [HFC-134a (R-134a) recycling equipment], or J2209 [HFC-134a (R-134a) recy-
cling equipment], If accidental system discharge occurs, ventilate work area before resuming
service. Additional health and safety information may be obtained from refrigerant and oil manufac-
turers.
- Do not allow A/C oil to come in contact with styrofoam parts. Damage may result.
CONTAMINATED REFRIGERANT
If a refrigerant other than pure HFC-134a (R-134a) is identified in a vehicle, your options are:
• Explain to the customer that environmental regulations prohibit the release of contaminated refrigerant into
the atmosphere.
• Explain that recovery of the contaminated refrigerant could damage your service equipment and refrigerant
supply.
• Suggest the customer return the vehicle to the location of previous service where the contamination may
have occurred.
• If you choose to perform the repair, recover the refrigerant using only dedicated equipment and contain-
ers. Do not recover contaminated refrigerant into your existing service equipment. If your facility does
2009 Pathfinder
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