Nissan Maxima. Manual - part 727

 

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Nissan Maxima. Manual - part 727

 

 

HAC-84

< SYMPTOM DIAGNOSIS >

[WITH COLOR DISPLAY]

INSUFFICIENT COOLING

Performance Chart

INFOID:0000000010051016

TEST CONDITION

Testing must be performed as follows:

*1

VTL-16, "BLOWER MOTOR : Re-
moval and Installation"

*2

HAC-53, "Diagnosis Procedure"

*3

HA-38, "Removal and Installation for 
Compressor Clutch"

*4

EM-14, "Checking Drive Belts"

*5

HA-37, "Removal and Installation for 
Compressor"

AWIIA1000GB

INSUFFICIENT COOLING

HAC-85

< SYMPTOM DIAGNOSIS >

[WITH COLOR DISPLAY]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

TEST READING

Recirculating-to-discharge Air Temperature Table

Ambient Air Temperature-to-operating Pressure Table

Vehicle location

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

Doors

Closed

Door windows

Open

Hood

Open

TEMP.

Max. COLD

Mode switch

(Ventilation) set

Intake switch

(Recirculation) set

(fan) 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

25 (77)

10.0 - 12.3 (50 - 54)

30 (86)

13.2 - 15.3 (56 - 60)

35 (95)

17.2 - 21.0 (63 - 70)

60 - 70

25 (77)

12.3 - 14.9 (54 - 59)

30 (86)

15.3 - 19.3 (60 - 67)

35 (95)

21.0 - 24.4 (70 - 76)

Ambient air

High-pressure (Discharge side)

kPa (kg/cm2, psi)

Low-pressure (Suction side)

kPa (kg/cm2, psi)

Relative humidity

%

Air temperature

°C (°F)

50 - 70

30 (86)

1,220 - 1,500
(12.44 - 15.30, 176.9 - 217.5)

240 - 295
(2.45 - 3.01, 34.8 - 42.8)

35 (95)

1,360 - 1,690
(13.87 - 17.24, 197.2 - 245.1)

275 - 335
(2.81 - 3.42, 39.9 - 48.6)

40 (104)

1,500 - 1,830
(12.44 - 18.67, 176.9 - 265.4)

310 - 375
(3.16 - 3.83, 45.0 - 54.4)

HAC-86

< SYMPTOM DIAGNOSIS >

[WITH COLOR DISPLAY]

INSUFFICIENT HEATING

INSUFFICIENT HEATING

Component Function Check

INFOID:0000000010051017

Symptom

• Insufficient heating

• No warm air comes out. (Airflow volume is normal.)

INSPECTION FLOW

1.

 CONFIRM SYMPTOM BY PERFORMING OPERATION CHECK - TEMPERATURE INCREASE

1. Press the AUTO switch. 

2. Turn temperature control dial (driver side) clockwise until 32

°C (90°F) is displayed.

3. Check for hot 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 and check for any symptoms. Refer to 

HAC-5, "Operational Check"

.

Does another symptom exist?

YES

>> Refer to 

HA-21, "WITH COLOR DISPLAY : Symptom Matrix Chart"

.

NO

>> System OK. 

3.

 CHECK FOR SERVICE BULLETINS

Check for any service bulletins.

>> GO TO 4

4.

 CHECK ENGINE COOLING SYSEM

1. Check for proper engine coolant level. Refer to 

CO-10, "System Inspection"

.

2. Check hoses for leaks or kinks.

3. Check radiator cap. Refer to 

CO-10, "System Inspection"

.

4. Check for air in cooling system.

>> GO TO 5

5.

CHECK SETTING OF TEMPERATURE SETTING TRIMMER

Using CONSULT, check the setting of “TEMP SET CORRECT” on “WORK SUPPORT” of HVAC. Refer to

HAC-6, "Temperature Setting Trimmer"

1. Check that the temperature setting trimmer is set to “

− direction”. 

NOTE:

The control temperature can be set by the temperature setting trimmer.

2. Set temperature control dial to “0”.
Is the symptom still present?

YES

>> GO TO 6. 

NO

>> Inspection End.

6.

CHECK WITH SELF-DIAGNOSIS FUNCTION OF CONSULT

1. Using CONSULT, perform “SELF-DIAGNOSIS RESULTS” of HVAC. 

2. Check if any DTC No. is displayed in the trouble diagnosis results. 

NOTE:

If DTC is displayed along with DTC U1000 or U1010, first diagnose the DTC U1000 or U1010. Refer to

HAC-30, "DTC Logic"

 or 

HAC-31, "DTC Logic"

Is any DTC No. displayed?

YES

>> Perform diagnosis for the applicable DTC. Refer to 

HAC-65, "DTC Index"

NO

>> GO TO 7.

INSUFFICIENT HEATING

HAC-87

< SYMPTOM DIAGNOSIS >

[WITH COLOR DISPLAY]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

7.

CHECK WITH ACTIVE TEST OF CONSULT

1. Using CONSULT, perform “HVAC TEST” in “ACTIVE TEST” of HVAC to check each output device. Refer

to 

HAC-26, "CONSULT Function"

NOTE:

Perform the ACTIVE TEST after starting the engine because the compressor is operating. 

2. Refer to the table and check the outlet, inlet, airflow temperature, blower motor control signal, magnet

clutch operation, and air mix ratio. Visually check each operating condition, by listening for noise, touching

air outlets with a hand, etc. 

Does it operate normally?

YES

>> GO TO 8.

NO-1 >> Air outlet does not change. Refer to 

HAC-49, "Diagnosis Procedure"

NO-2 >> Air inlet does not change. Refer to 

HAC-52, "Diagnosis Procedure"

NO-3 >> Discharge air temperature does not change. Refer to 

HAC-45, "Diagnosis Procedure"

 and 

HAC-

47, "Diagnosis Procedure"

NO-4 >> Blower motor does not operate normally. Refer to 

HAC-53, "Diagnosis Procedure"

NO-5 >> Magnet clutch does not operate. Refer to 

HAC-57, "Diagnosis Procedure"

8.

 CHECK AIR DUCTS

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

YES

>> GO TO 9

NO

>> Repair all disconnected or leaking air ducts.

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

>> Hot inlet hose and a warm outlet hose: GO TO 10

NO

>> Both hoses warm: GO TO 11

10.

 CHECK ENGINE COOLANT SYSTEM 

Check thermostat operation. Refer to 

CO-22, "Removal and Installation"

.

Is the inspection result normal?

YES

>> System OK.

NO

>> Repair or replace as necessary. 

11.

 CHECK HEATER HOSES 

Check heater hoses for proper installation.
Is the inspection result normal?

YES

>> System OK.

NO

>> 1. Backflush heater core.

2. Drain the water from the system.

3. Refill system with new engine coolant. Refer to 

CO-11, "Changing Engine Coolant"

.

Test item

MODE 1

MODE 2

MODE 3

MODE 4

MODE 5

MODE 6

Mode door position

VENT1

B/L1

B/L2

FOOT

D/F

DEF

Intake door position

REC

REC

20%FRE

FRE

FRE

FRE

Air mix door position 
(driver & passenger 
side)

FULL COLD

FULL COLD

FULL HOT

FULL HOT

FULL HOT

FULL HOT

Blower motor duty ratio

37%

91%

65%

65%

65%

91%

Compressor (Magnet 
clutch)

ON

ON

OFF

OFF

ON

ON

 

 

 

 

 

 

 

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