Nissan Frontier. Manual - part 880

HAC-74

< SYMPTOM DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

INSUFFICIENT COOLING

>> GO TO 9.

9.

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 10.

NO

>> Check contaminated refrigerant. Refer to 

HAC-86, "Working with HFC-134a (R-134a)"

.

10.

CHECK FOR EVAPORATOR FREEZE UP

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

YES

>> Perform performance test diagnoses. Refer to 

HAC-74, "Diagnostic Work Flow"

.

NO

>> GO TO 11.

11.

CHECK REFRIGERANT PRESSURE

Check refrigerant pressure with manifold gauge connected. Refer to 

HAC-76, "Performance Chart"

. 

Is the inspection result normal?

YES

>> Perform performance test diagnoses. Refer to 

HAC-74, "Diagnostic Work Flow"

.

NO

>> GO TO 12.

12.

CHECK AIR DUCTS

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

YES

>> System OK.

NO

>> Repair air leaks.

Diagnostic Work Flow

INFOID:0000000009478310

INSUFFICIENT COOLING

HAC-75

< SYMPTOM DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

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*1

HA-18, "Checking System for Leaks 
Using the Fluorescent Dye Leak De-
tector"

*2

HA-25, "Removal and Installation for 
Compressor"

*3

HAC-76, "Performance Chart"

*4

HAC-77, "Trouble Diagnoses for Ab-
normal Pressure"

*5

HAC-26, "Air Mix Door Motor (Driver) 
Component Function Check"

AWIIA0999GB

HAC-76

< SYMPTOM DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

INSUFFICIENT COOLING

Performance Chart

INFOID:0000000009478311

TEST CONDITION

Testing must be performed as follows:

*1

VTL-11, "Removal and Installation"

*2

HAC-37, "Front Blower Motor Com-
ponent Function Check"

*3

HA-27, "Removal and Installation for 
Compressor Clutch"

*4

EM-14, "Checking Drive Belts"

 

(QR25DE) or 

EM-129, "Checking 

Drive Belts"

 (VQ40DE)

*5

HA-25, "Removal and Installation for 
Compressor"

AWIIA1000GB

INSUFFICIENT COOLING

HAC-77

< SYMPTOM DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

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Recirculating-to-discharge Air Temperature Table

Ambient Air Temperature-to-operating Pressure Table

Trouble Diagnoses for Abnormal Pressure

INFOID:0000000009478312

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-

dard (usual) pressure, however, differs from vehicle to vehicle, refer to above table (Ambient air temperature-

to-operating pressure table).

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)

9.9 - 13.9 (50 - 57)

25 (77)

14.6 - 18.6 (58 - 65)

30 (86)

16.8 - 21.8 (62 - 71)

35 (95)

21.1 - 27.1 (70 - 81)

40 (104)

25.3 - 31.5 (78 - 89)

60 - 70

20 (68)

11.4 - 15.2 (53 - 59)

25 (77)

15.5 - 20.0 (60 - 68)

30 (86)

19.9 - 25.0 (68 - 77)

35 (95)

24.5 - 29.6 (76 - 85)

40 (104)

28.7 - 34.9 (84 - 95)

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)

1020 - 1250

(10.4 - 12.7, 147.9 - 181.3)

160 - 190

(1.63 - 1.94, 23.2 - 27.6)

25 (77)

1236 - 1510

(12.6 - 15.4, 179.2 - 219)

206 - 245

(2.1 - 2.5, 29.9 - 35.6)

30 (86)

1569 - 1,922

(16.0 - 19.6, 227.6 - 278.8)

265 - 324

(2.7 - 3.3, 38.4 - 46.9)

35 (95)

1,697 - 2079

(17.3 - 21.2, 246.1 - 301.5)

304 - 363

(3.1 - 3.7, 44.1 - 52.6)

40 (104)

1971 - 2403

(20.1 - 24.5, 285.9 - 348.5)

373 - 451

(3.8 - 4.6, 54.0 - 65.4)