Nissan Maxima. Instruction — part 726
HAC-80
< SYMPTOM DIAGNOSIS >
[WITH COLOR DISPLAY]
INSUFFICIENT COOLING
SYMPTOM DIAGNOSIS
INSUFFICIENT COOLING
Component Function Check
INFOID:0000000010051014
Symptom
• Insufficient cooling
• No cool air comes out. (Airflow volume is normal.)
INSPECTION FLOW
1.
CONFIRM SYMPTOM BY PERFORMING OPERATION CHECK - TEMPERATURE DECREASE
1. Press the AUTO switch.
2. Turn temperature control dial (driver side) counterclockwise until 18
°C (60°F) is displayed.
3. 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 and check for any symptoms. Refer to
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 DRIVE BELTS
Check compressor belt tension. Refer to
.
Is the inspection result normal?
YES
>> GO TO 5
NO
>> Adjust or replace A/C compressor belt. Refer to
EM-14, "Removal and Installation"
.
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 with the setting of 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.
INSUFFICIENT COOLING
HAC-81
< SYMPTOM DIAGNOSIS >
[WITH COLOR DISPLAY]
C
D
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A
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HAC
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7.
CHECK WITH ACTIVE TEST OF CONSULT
1. Using CONSULT, perform “HVAC TEST”“ACTIVE TEST” of HVAC to check each output device. Refer to
.
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
.
NO-2 >> Air inlet does not change. Refer to
.
NO-3 >> Discharge air temperature does not change. Refer to
.
NO-4 >> Blower motor does not operate normally. Refer to
NO-5 >> Magnet clutch does not operate. Refer to
8.
CHECK AIR MIX DOOR MOTOR OPERATION
Check and verify air mix door mechanism for smooth operation.
Does air mix door operate correctly?
YES
>> GO TO 9
NO
>> Repair or replace air mix door control linkage.
9.
CHECK COOLING FAN MOTOR OPERATION
Check and verify cooling fan motor for smooth operation.
Does cooling fan motor operate correctly?
YES
>> GO TO 10
NO
>> Check cooling fan motor. Refer to
EC-486, "Component Function Check"
.
10.
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 11
11.
CHECK REFRIGERANT PURITY
1. Connect recovery/recycling equipment to vehicle.
2. Confirm refrigerant purity in supply tank using recovery/recycling and refrigerant indentifier.
Is the inspection result normal?
YES
>> GO TO 12
NO
>> Check contaminated refrigerant. Refer to
.
12.
CHECK REFRIGERANT PRESSURE
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
HAC-82
< SYMPTOM DIAGNOSIS >
[WITH COLOR DISPLAY]
INSUFFICIENT COOLING
Check refrigerant pressure with manifold gauge connected. Refer to
EC-515, "Component Function Check"
Is the inspection result normal?
YES
>> Perform diagnostic work flow. Refer to
HAC-82, "Diagnostic Work Flow"
.
NO
>> GO TO 13
13.
CHECK FOR EVAPORATOR FREEZE-UP
Start engine and run A/C. Check for evaporator freeze-up.
NOTE:
Evaporator freeze up usually occurs at sustained highway speeds in hot, humid conditions with blend door at
full cold and blower on low speed, after 1-3 hours of continuous driving.
Does evaporator freeze up?
YES
>> Perform diagnostic work flow. Refer
HAC-82, "Diagnostic Work Flow"
NO
>> GO TO 14
14.
CHECK AIR DUCTS
Check ducts for air leaks.
Is the inspection result normal?
YES
>> System OK.
NO
>> Repair air leaks.
Diagnostic Work Flow
INFOID:0000000010051015
INSUFFICIENT COOLING
HAC-83
< SYMPTOM DIAGNOSIS >
[WITH COLOR DISPLAY]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
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*1
*2
HA-37, "Removal and Installation for
Compressor"
*3
*4
HA-19, "WITH COLOR DISPLAY :
Trouble Diagnoses for Abnormal
Pressure"
*5
(driver) or
(passenger)
AWIIA0999GB
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