Nissan Maxima. Instruction — part 752
HAC-184
< SYMPTOM DIAGNOSIS >
[WITH MONOCHROME DISPLAY]
INSUFFICIENT COOLING
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 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 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%
A/C compressor (Mag-
net clutch)
ON
ON
OFF
OFF
ON
ON
INSUFFICIENT COOLING
HAC-185
< SYMPTOM DIAGNOSIS >
[WITH MONOCHROME DISPLAY]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
Check refrigerant pressure with manifold gauge connected. Refer to
Is the inspection result normal?
YES
>> Perform diagnostic work flow. Refer to
HAC-185, "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-185, "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:0000000010051179
HAC-186
< SYMPTOM DIAGNOSIS >
[WITH MONOCHROME DISPLAY]
INSUFFICIENT COOLING
*1
*2
HA-37, "Removal and Installation for
Compressor"
*3
*4
HA-22, "WITH MONOCHROME DIS-
PLAY : Trouble Diagnoses for Abnor-
mal Pressure"
*5
HAC-148, "Diagnosis Procedure"
(driver) or
(passenger)
AWIIA0999GB
INSUFFICIENT COOLING
HAC-187
< SYMPTOM DIAGNOSIS >
[WITH MONOCHROME DISPLAY]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
Performance Chart
INFOID:0000000010051180
TEST CONDITION
Testing must be performed as follows:
*1
VTL-16, "BLOWER MOTOR : Re-
moval and Installation"
*2
HAC-157, "Diagnosis Procedure"
*3
HA-38, "Removal and Installation for
Compressor Clutch"
*4
*5
HA-37, "Removal and Installation for
Compressor"
AWIIA1000GB
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