Nissan Maxima. Instruction — part 753
HAC-188
< SYMPTOM DIAGNOSIS >
[WITH MONOCHROME DISPLAY]
INSUFFICIENT COOLING
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)
INSUFFICIENT HEATING
HAC-189
< SYMPTOM DIAGNOSIS >
[WITH MONOCHROME DISPLAY]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
INSUFFICIENT HEATING
Component Function Check
INFOID:0000000010051181
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 switch (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
.
Does another symptom exist?
YES
>> Refer to
HA-25, "WITH MONOCHROME 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
.
2. Check hoses for leaks or kinks.
3. Check radiator cap. Refer to
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-109, "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
Is any DTC No. displayed?
YES
>> Perform diagnosis for the applicable DTC. Refer to
NO
>> GO TO 7.
HAC-190
< SYMPTOM DIAGNOSIS >
[WITH MONOCHROME DISPLAY]
INSUFFICIENT HEATING
7.
CHECK WITH ACTIVE TEST OF CONSULT
1. Using CONSULT, perform “HVAC TEST” in “ACTIVE TEST” of HVAC to check each output device. Refer
.
NOTE:
Perform the ACTIVE TEST after starting the engine because the A/C 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-153, "Diagnosis Procedure"
NO-2 >> Air inlet does not change. Refer to
HAC-156, "Diagnosis Procedure"
.
NO-3 >> Discharge air temperature does not change. Refer to
HAC-148, "Diagnosis Procedure"
.
NO-4 >> Blower motor does not operate normally. Refer to
HAC-157, "Diagnosis Procedure"
NO-5 >> Magnet clutch does not operate. Refer to
HAC-161, "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%
A/C Compressor (Mag-
net clutch)
ON
ON
OFF
OFF
ON
ON
INSUFFICIENT HEATING
HAC-191
< SYMPTOM DIAGNOSIS >
[WITH MONOCHROME DISPLAY]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
4. To retest GO TO 12
12.
CHECK HEATER HOSE TEMPERATURES
1. Start engine and warm 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
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