Nissan Frontier. Manual — part 897
HAC-142
< SYMPTOM DIAGNOSIS >
[MANUAL A/C (TYPE 1)]
AIR CONDITIONER CONTROL
AIR CONDITIONER CONTROL
Symptom Matrix Chart
INFOID:0000000009478361
SYMPTOM TABLE
Symptom
Reference Page
A/C system does not come on.
Go to Trouble Diagnosis Procedure for A/C System.
Air outlet does not change.
Go to Trouble Diagnosis Procedure for Mode Door Motor.
Mode door motor is malfunctioning.
Discharge air temperature does not change.
Go to Trouble Diagnosis Procedure for Air Mix Door Motor.
Air mix door motor is malfunctioning.
Intake door does not change.
Go to Trouble Diagnosis Procedure for Intake Door Motor.
Intake door motor is malfunctioning.
Front blower motor operation is malfunctioning. Go to Trouble Diagnosis Procedure for Front Blower Motor.
Magnet clutch does not engage.
Go to Trouble Diagnosis Procedure for Magnet Clutch.
Insufficient cooling
Go to Trouble Diagnosis Procedure for Insufficient Cooling.
Insufficient heating
Go to Trouble Diagnosis Procedure for Insufficient Heating.
Noise
Go to Trouble Diagnosis Procedure for Noise.
Self-Diagnosis cannot be performed
Go to Trouble Diagnosis Procedure for Self-Diagnosis.
INSUFFICIENT COOLING
HAC-143
< SYMPTOM DIAGNOSIS >
[MANUAL A/C (TYPE 1)]
C
D
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F
G
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A
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HAC
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INSUFFICIENT COOLING
Component Function Check
INFOID:0000000009478362
SYMPTOM: Insufficient cooling
INSPECTION FLOW
1.
CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - TEMPERATURE DECREASE
1. Turn temperature control dial counterclockwise to maximum cold.
2. Check for cold air at discharge air outlets.
Can the symptom be duplicated?
YES
>> GO TO 3.
NO
>> GO TO 2.
2.
CHECK FOR ANY SYMPTOMS
Perform a complete operational check for any symptoms. Refer to
Does another symptom exist?
YES
>> Refer to
HAC-142, "Symptom Matrix Chart"
NO
>> System OK.
3.
CHECK FOR SERVICE BULLETINS
Check for any service bulletins.
>> GO TO 4.
4.
PERFORM SELF-DIAGNOSIS
Perform self-diagnosis. Refer to
HAC-101, "Front Air Control Self-Diagnosis"
.
Is the inspection result normal?
YES
>> GO TO 5.
NO
>> Check symptom chart. Refer to
HAC-142, "Symptom Matrix Chart"
5.
CHECK DRIVE BELTS
Check compressor belt tension. Refer to
(VQ40DE).
Is the inspection result normal?
YES
>> GO TO 6.
NO
>> Adjust or replace compressor belt. Refer to
(QR25DE) or
6.
CHECK AIR MIX DOOR OPERATION
Check and verify air mix door mechanism for smooth operation.
Does air mix door operate correctly?
YES (QR25DE)>>GO TO 8.
YES (VQ40DE)>>GO TO 7.
NO
>> Repair or replace air mix door control linkage.
7.
CHECK COOLING FAN MOTOR OPERATION
Check and verify cooling fan motor for smooth operation. Refer to
EC-925, "Component Inspection"
(for USA
and Canada) or
EC-1343, "Component Inspection"
Does cooling fan motor operate correctly?
YES
>> GO TO 8.
NO
>> Check cooling fan motor. Refer to
(for USA and Canada) or
(for Mexico).
8.
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.
HAC-144
< SYMPTOM DIAGNOSIS >
[MANUAL A/C (TYPE 1)]
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
HA-3, "Contaminated Refrigerant"
.
10.
CHECK FOR EVAPORATOR FREEZE UP
Start engine and run A/C. Check for evaporator freeze up.
Does evaporator freeze up?
YES
>> Perform diagnostic work flow. Refer to
HAC-144, "Diagnostic Work Flow"
NO
>> GO TO 11.
11.
CHECK REFRIGERANT PRESSURE
Check refrigerant pressure with manifold gauge connected. Refer to
Is the inspection result normal?
YES
>> Perform diagnostic work flow. Refer to
HAC-144, "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:0000000009478363
INSUFFICIENT COOLING
HAC-145
< SYMPTOM DIAGNOSIS >
[MANUAL A/C (TYPE 1)]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
*1
HA-18, "Checking System for Leaks
Using the Fluorescent Dye Leak De-
tector"
*2
HA-25, "Removal and Installation for
Compressor"
*3
*4
HAC-147, "Trouble Diagnoses for
Abnormal Pressure"
*5
HAC-108, "Air Mix Door Motor Diag-
nosis Procedure"
AWIIA0999GB
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