Nissan Pathfinder (2012 year). Instruction - part 433

 

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Nissan Pathfinder (2012 year). Instruction - part 433

 

 

HAC-186

< SYMPTOM DIAGNOSIS >

[MANUAL AIR CONDITIONER]

INSUFFICIENT COOLING

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 

HA-31, "Check-

ing of Refrigerant Leaks"

.

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 

HAC-164, "Intake 

Sensor Diagnosis Proce-
dure"

.

• Replace compressor.
• Repair evaporator fins.
• Replace evaporator.
• Refer  to 

HAC-153, "Front 

Blower Motor Component 
Function Check"

.

AC353A

August 2012

2012 Pathfinder

INSUFFICIENT COOLING

HAC-187

< SYMPTOM DIAGNOSIS >

[MANUAL AIR CONDITIONER]

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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

August 2012

2012 Pathfinder

HAC-188

< SYMPTOM DIAGNOSIS >

[MANUAL AIR CONDITIONER]

INSUFFICIENT HEATING

INSUFFICIENT HEATING

Component Function Check

INFOID:0000000007356456

SYMPTOM: Insufficient heating

INSPECTION FLOW

1.

CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - TEMPERATURE INCREASE 

1. Rotate blower control dial clockwise.

2. Turn the temperature control dial clockwise to maximum heat.

3. Check for hot air at discharge air outlets.
Is the inspection result normal?

YES

>> GO TO 2. 

NO

>> Perform complete operational check (front). Refer to 

HAC-129, "Operational Check"

.

2.

CHECK FOR SERVICE BULLETINS

Check for any service bulletins.

>> GO TO 3.

3.

CHECK ENGINE COOLING SYSTEM

1. Check for proper engine coolant level. 

2. Check hoses for leaks or kinks.

3. Check radiator cap. Refer to 

CO-11, "System Inspection"

.

4. Check for air in cooling system.

>> GO TO 4.

4.

CHECK AIR MIX DOOR OPERATION 

Check the operation of the air mix door.
Is the inspection result normal?

YES

>> GO TO 5.

NO

>> Check the air mix door motor circuit. Refer to 

HAC-147, "Air Mix Door Motor Component Function

Check"

.

5.

CHECK AIR DUCTS 

Check for disconnected or leaking air ducts.
Is the inspection result normal?

YES

>> GO TO 6.

NO

>> Repair all disconnected or leaking air ducts.

6.

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

>> Hot inlet hose and a warm outlet hose: GO TO 7.

NO

>> Both hoses warm: GO TO 8.

7.

CHECK ENGINE COOLANT SYSTEM 

Check engine coolant temperature sensor. Refer to 

EC-134, "Component Inspection"

.

Is the inspection result normal?

YES

>> System OK.

NO

>> Repair or replace as necessary. Retest.

8.

CHECK HEATER HOSES 

Check heater hoses for proper installation.

August 2012

2012 Pathfinder

INSUFFICIENT HEATING

HAC-189

< SYMPTOM DIAGNOSIS >

[MANUAL AIR CONDITIONER]

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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"

. 

4. GO TO 9 to retest.   

9.

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

>> System OK.

NO

>> Replace heater core. Refer to 

VTL-26, "Removal and Installation"

.

August 2012

2012 Pathfinder

HAC-190

< SYMPTOM DIAGNOSIS >

[MANUAL AIR CONDITIONER]

NOISE

NOISE

Component Function Check

INFOID:0000000007356457

SYMPTOM: Noise

INSPECTION FLOW

*1

HAC-129, "Operational Check"

*2

EM-14, "Checking Drive Belts"

*3

HAC-183, "Performance Chart"

AWIIA1001GB

August 2012

2012 Pathfinder

HAC-192

< PRECAUTION >

[MANUAL AIR CONDITIONER]

PRECAUTIONS

PRECAUTION

PRECAUTIONS

Precaution for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT BELT 
PRE-TENSIONER"

INFOID:0000000007356458

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 Instruction. SRS wiring harnesses can be identified by yellow and/or orange harnesses or har-

ness connectors.

PRECAUTIONS WHEN USING POWER TOOLS (AIR OR ELECTRIC) AND HAMMERS

WARNING:

• When working near the Airbag Diagnosis Sensor Unit or other Airbag System sensors with the Igni-

tion ON or engine running, DO NOT use air or electric power tools or strike near the sensor(s) with a

hammer. Heavy vibration could activate the sensor(s) and deploy the air bag(s), possibly causing

serious injury.

• When using air or electric power tools or hammers, always switch the Ignition OFF, disconnect the

battery, and wait at least 3 minutes before performing any service.

Precaution Necessary for Steering Wheel Rotation After Battery Disconnect

INFOID:0000000007836022

NOTE:

• This Procedure is applied only to models with Intelligent Key system and NATS (NISSAN ANTI-THEFT SYS-

TEM).

• Remove and install all control units after disconnecting both battery cables with the ignition knob in the

″

LOCK

″

 position.

• Always use CONSULT to perform self-diagnosis as a part of each function inspection after finishing work. If

DTC is detected, perform trouble diagnosis according to self-diagnostic results.

For models equipped with the Intelligent Key system and NATS, an electrically controlled steering lock mech-

anism is adopted on the key cylinder.

For this reason, if the battery is disconnected or if the battery is discharged, the steering wheel will lock and

steering wheel rotation will become impossible.

If steering wheel rotation is required when battery power is interrupted, follow the procedure below before

starting the repair operation.

OPERATION PROCEDURE

1. Connect both battery cables.

NOTE:

Supply power using jumper cables if battery is discharged.

2. Use the Intelligent Key or mechanical key to turn the ignition switch to the 

″

ACC

″

 position. At this time, the

steering lock will be released.

3. Disconnect both battery cables. The steering lock will remain released and the steering wheel can be

rotated.

4. Perform the necessary repair operation.

August 2012

2012 Pathfinder

PRECAUTIONS

HAC-193

< PRECAUTION >

[MANUAL AIR CONDITIONER]

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5. When the repair work is completed, return the ignition switch to the 

″

LOCK

″

 position before connecting

the battery cables. (At this time, the steering lock mechanism will engage.)

6. Perform a self-diagnosis check of all control units using CONSULT. 

Working with HFC-134a (R-134a)

INFOID:0000000007356459

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

not have dedicated recovery equipment, you may contact a local refrigerant product retailer for available ser-

vice. This refrigerant must be disposed of in accordance with all federal and local regulations. In addition,

replacement of all refrigerant system components on the vehicle is recommended.

• If the vehicle is within the warranty period, the air conditioner warranty is void. Please contact NISSAN Cus-

tomer Affairs for further assistance.

Precaution for Service Equipment

INFOID:0000000007356460

MANIFOLD GAUGE SET

Be certain that the gauge face indicates R-134a or 134a. Make sure

the gauge set has 1/2

″

-16 ACME threaded connections for service

hoses. Confirm the set has been used only with refrigerant HFC-

134a (R-134a) along with specified oil.

SHA533D

August 2012

2012 Pathfinder

 

 

 

 

 

 

 

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