Nissan Pathfinder (2012 year). Manual — part 432

HAC-178

< WIRING DIAGRAM >

[MANUAL AIR CONDITIONER]

AIR CONDITIONER CONTROL

ABIIA0799GB

August 2012

2012 Pathfinder

AIR CONDITIONER CONTROL

HAC-179

< SYMPTOM DIAGNOSIS >

[MANUAL AIR CONDITIONER]

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SYMPTOM DIAGNOSIS

AIR CONDITIONER CONTROL

Symptom Matrix Chart

INFOID:0000000007356451

SYMPTOM TABLE

Symptom

Reference Page

A/C system does not come on.

Go to Trouble Diagnosis Procedure for A/C System.

HAC-167

Air outlet does not change.

Go to Trouble Diagnosis Procedure for Mode Door Motor.

HAC-142

Mode door motor is malfunctioning.

Discharge air temperature does not change.

Go to Trouble Diagnosis Procedure for Air Mix Door Motor.

HAC-147

Air mix door motor is malfunctioning.

Intake door does not change.

Go to Trouble Diagnosis Procedure for Intake Door Motor.

HAC-150

Intake door motor is malfunctioning.

Front blower motor operation is malfunctioning. Go to Trouble Diagnosis Procedure for Front Blower Motor.

HAC-153

Magnet clutch does not engage.

Go to Trouble Diagnosis Procedure for Magnet Clutch.

HAC-160

Insufficient cooling

Go to Trouble Diagnosis Procedure for Insufficient Cooling.

HAC-180

Insufficient heating

Go to Trouble Diagnosis Procedure for Insufficient Heating.

HAC-188

Noise

Go to Trouble Diagnosis Procedure for Noise.

HAC-190

August 2012

2012 Pathfinder

HAC-180

< SYMPTOM DIAGNOSIS >

[MANUAL AIR CONDITIONER]

INSUFFICIENT COOLING

INSUFFICIENT COOLING

Component Function Check

INFOID:0000000007356452

SYMPTOM: Insufficient cooling

INSPECTION FLOW

1.

CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - TEMPERATURE DECREASE

1. Turn temperature control dial counterclockwise to maximum cold.

2. Check for cold air at discharge air outlets.
Is the inspection result normal?

YES

>> GO TO 3.

NO

>> GO TO 2.

2.

CHECK FOR ANY SYMPTOMS

Perform a complete operational check for any symptoms. Refer to

HAC-129, "Operational Check"

.

Does another symptom exist?

YES

>> Refer to

HAC-179, "Symptom Matrix Chart"

.

NO

>> System OK.

3.

CHECK FOR SERVICE BULLETINS

Check for any service bulletins.

>> GO TO 4.

4.

CHECK DRIVE BELTS

Check compressor belt tension. Refer to

EM-14, "Checking Drive Belts"

.

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> Adjust or replace compressor belt. Refer to

EM-14, "Checking Drive Belts"

.

5.

CHECK AIR MIX DOOR OPERATION

Check and verify air mix door mechanism for smooth operation.
Does air mix door operate correctly?

YES

>> GO TO 6.

NO

>> Repair or replace air mix door control linkage.

6.

CHECK COOLING FAN MOTOR OPERATION

Check and verify cooling fan motor for smooth operation. Refer to

EC-399, "Component Inspection"

.

Does cooling fan motor operate correctly?

YES

>> GO TO 7.

NO

>> Check cooling fan motor. Refer to

EC-398, "Diagnosis Procedure"

.

7.

CHECK RECOVERY/RECYCLING EQUIPMENT BEFORE USAGE

Check recovery/recycling equipment before connecting to vehicle. Verify there is no pressure in the recovery/

recycling equipment by checking the gauges. If pressure exists, recover refrigerant from equipment lines.

>> GO TO 8.

8.

CHECK REFRIGERANT PURITY

1. Connect recovery/recycling equipment to vehicle.

2. Confirm refrigerant purity in supply tank using recovery/recycling and refrigerant identifier.
Is the inspection result normal?

YES

>> GO TO 9.

NO

>> Check contaminated refrigerant. Refer to

HA-4, "Contaminated Refrigerant"

.

August 2012

2012 Pathfinder

INSUFFICIENT COOLING

HAC-181

< SYMPTOM DIAGNOSIS >

[MANUAL AIR CONDITIONER]

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9.

CHECK FOR EVAPORATOR FREEZE UP

Start engine and run A/C. Check for evaporator freeze up.
Does evaporator freeze up?

YES

>> Perform diagnostic work flow. Refer to

HAC-181, "Diagnostic Work Flow"

.

NO

>> GO TO 10.

10.

CHECK REFRIGERANT PRESSURE

Check refrigerant pressure with manifold gauge connected. Refer to

HAC-183, "Performance Chart"

.

Is the inspection result normal?

YES

>> GO TO 11.

NO

>> Perform diagnostic work flow. Refer to

HAC-181, "Diagnostic Work Flow"

.

11.

CHECK AIR DUCTS

Check ducts for air leaks.
Is the inspection result normal?

YES

>> System OK.

NO

>> Repair air leaks.

Diagnostic Work Flow

INFOID:0000000007356453

August 2012

2012 Pathfinder

HAC-182

< SYMPTOM DIAGNOSIS >

[MANUAL AIR CONDITIONER]

INSUFFICIENT COOLING

*1

HA-29, "Checking System for Leaks
Using the Fluorescent Dye Leak De-
tector"

*2

HA-53, "Removal and Installation for
Condenser"

*3

HAC-183, "Performance Chart"

*4

HAC-184, "Trouble Diagnoses for
Abnormal Pressure"

*5

HAC-147, "Air Mix Door Motor Diag-
nosis Procedure"

AWIIA0999GB

August 2012

2012 Pathfinder

INSUFFICIENT COOLING

HAC-183

< SYMPTOM DIAGNOSIS >

[MANUAL AIR CONDITIONER]

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Performance Chart

INFOID:0000000007356454

TEST CONDITION

Testing must be performed as follows:

*1

VTL-12, "Removal and Installation"

*2

HAC-154, "Front Blower Motor Diag-
nosis Procedure"

*3

HA-40, "Removal and Installation for
Compressor Clutch"

*4

EM-14, "Checking Drive Belts"

*5

HA-38, "Removal and Installation for
Compressor"

AWIIA1000GB

August 2012

2012 Pathfinder

HAC-184

< SYMPTOM DIAGNOSIS >

[MANUAL AIR CONDITIONER]

INSUFFICIENT COOLING

TEST READING

Recirculating-to-discharge Air Temperature Table

Ambient Air Temperature-to-operating Pressure Table

Trouble Diagnoses for Abnormal Pressure

INFOID:0000000007356455

Whenever system

′

s 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-

Vehicle location

Indoors or in the shade (in a well-ventilated place)

Doors

Closed

Door window

Open

Hood

Open

TEMP.

Max. COLD

Mode switch

(Ventilation) set

Recirculation (REC) switch

(Recirculation) set

Blower speed

Max. speed set

Engine speed

Idle speed

Operate the air conditioning system for 10 minutes before taking measurements.

Inside air (Recirculating air) at blower assembly inlet

Discharge air temperature at center ventilator

°

C (

°

F)

Relative humidity

%

Air temperature

°

C (

°

F)

50 - 60

20 (68)

5.3 - 6.5 (42 - 44)

25 (77)

9.7 - 11.5 (49 - 53)

30 (86)

13.8 - 16.3 (57 - 61)

35 (95)

18.0 - 21.2 (64 - 70)

40 (104)

22.2 - 25.7 (72 - 78)

60 - 70

20 (68)

6.5 - 7.7 (44 - 46)

25 (77)

11.5 - 13.3 (53 - 56)

30 (86)

16.3 - 18.8 (61 - 66)

35 (95)

21.2 - 24.0 (70 - 75)

40 (104)

25.7 - 29.2 (78 - 85)

Ambient air

High-pressure (Discharge side)

kPa (kg/cm

2

, psi)

Low-pressure (Suction side)

kPa (kg/cm

2

, psi)

Relative humidity

%

Air temperature

°

C (

°

F)

50 - 70

20 (68)

680 - 840

(6.94 - 8.57, 98.6 - 121.8)

160 - 198

(1.63 - 2.02, 23.2 - 28.7)

25 (77)

800 - 985

(8.16 - 10.05, 116.0 - 142.8)

198 - 245

(2.02 - 2.50, 28.7 - 35.5)

30 (86)

940 - 1,150

(9.59 - 11.73, 136.3 - 166.8)

225 - 278

(2.30 - 2.84, 32.6 - 40.3)

35 (95)

1,160 - 1,410

(11.83 - 14.38, 168.2 - 204.5)

273 - 335

(2.78 - 3.42, 39.6 - 48.6)

40 (104)

1,325 - 1,620

(13.52 - 16.52, 192.1 - 234.9)

325 - 398

(3.32 - 4.06, 47.1 - 57.7)

August 2012

2012 Pathfinder

INSUFFICIENT COOLING

HAC-185

< SYMPTOM DIAGNOSIS >

[MANUAL AIR CONDITIONER]

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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

High-pressure Side is Too High and Low-pressure Side is Too Low

High-pressure Side is Too Low and Low-pressure Side is Too High

Gauge indication

Refrigerant cycle

Probable cause

Corrective action

Both high- and low-pressure sides
are too high.

Pressure is reduced soon af-
ter water is splashed on con-
denser.

Excessive refrigerant charge in
refrigeration cycle

Reduce refrigerant until speci-
fied pressure is obtained.

Air suction by cooling fan is in-
sufficient.

Insufficient condenser cooling
performance

↓

1.

Condenser fins are
clogged.

2.

Improper fan rotation of
cooling fan

• Clean condenser.
• Check and repair cooling fan

if necessary.

• Low-pressure pipe is not

cold.

• When compressor is

stopped high-pressure val-
ue quickly drops by approx-
imately 196 kPa (2 kg/cm

2

,

28 psi). It then decreases
gradually thereafter.

Poor heat exchange in con-
denser
(After compressor operation
stops, high-pressure decreas-
es too slowly.)

↓

Air in refrigeration cycle

Evacuate and recharge system.

Engine tends to overheat.

Engine cooling systems mal-
function.

Check and repair engine cool-
ing system.

• An area of the low-pressure

pipe is colder than areas
near the evaporator outlet.

• Plates are sometimes cov-

ered with frost.

• Excessive liquid refrigerant

on low-pressure side

• Excessive refrigerant dis-

charge flow

• Expansion valve is open a lit-

tle compared with the speci-
fication.

↓

Improper expansion valve ad-
justment

Replace expansion valve.

AC359A

Gauge indication

Refrigerant cycle

Probable cause

Corrective action

High-pressure side is too high and
low-pressure side is too low.

Upper side of condenser and
high-pressure side are hot,
however, liquid tank is not so
hot.

High-pressure tube or parts lo-
cated between compressor
and condenser are clogged or
crushed.

• Check and repair or replace

malfunctioning parts.

• Check oil for contamination.

AC360A

August 2012

2012 Pathfinder