Nissan Sentra. Manual — part 583
HAC-180
< DTC/CIRCUIT DIAGNOSIS >
[MANUAL AIR CONDITIONER]
ECV (ELECTRICAL CONTROL VALVE)
Is the inspection result normal?
YES
>> GO TO 6.
NO
>> Replace compressor. Refer to
HA-31, "COMPRESSOR : Removal and Installation"
6.
CHECK INTERMITTENT INCIDENT
GI-39, "Intermittent Incident"
Is the inspection result normal?
YES
>> Replace A/C auto amp. Refer to
HAC-189, "Removal and Installation"
.
NO
>> Repair or replace malfunctioning parts.
Component Inspection
INFOID:0000000009757769
1.
CHECK ECV (ELECTRICAL CONTROL VALVE)
1. Turn ignition switch OFF.
2. Disconnect compressor connector.
3. Check continuity between compressor connector F88 terminals.
Is the inspection result normal?
YES
>> Inspection End.
NO
>> Replace compressor. Refer to
HA-31, "COMPRESSOR : Removal and Installation"
Terminals
Condition
Resistance (k
Ω)
Temperature:
°C (°F)
3
4
20 (68)
10.1 – 11.1
HEATER AND AIR CONDITIONING SYSTEM CONTROL SYMPTOMS
HAC-181
< SYMPTOM DIAGNOSIS >
[MANUAL AIR CONDITIONER]
C
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HAC
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SYMPTOM DIAGNOSIS
HEATER AND AIR CONDITIONING SYSTEM CONTROL SYMPTOMS
Symptom Table
INFOID:0000000009757770
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 does not operate normally.
Discharge air temperature does not change.
Go to Trouble Diagnosis Procedure for Air Mix Door Motor
Air mix door motor does not operate normal-
ly.
Intake door does not change.
Go to Trouble Diagnosis Procedure for Intake Door Motor
Intake door motor does not operate normally.
Blower motor operation is malfunctioning.
Go to Trouble Diagnosis Procedure for 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.
HAC-182
< SYMPTOM DIAGNOSIS >
[MANUAL AIR CONDITIONER]
INSUFFICIENT COOLING
INSUFFICIENT COOLING
Component Function Check
INFOID:0000000009757771
SYMPTOM: Insufficient cooling
INSPECTION FLOW
1.
CONFIRM SYMPTOM BY PERFORMING OPERATION CHECK - TEMPERATURE DECREASE
1. Press the A/C switch.
2. Turn temperature control dial counterclockwise to maximum cold.
3. Check for cold air at discharge air outlets.
Can a symptom be duplicated?
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
.
NO
>> System OK.
3.
CHECK FOR SERVICE BULLETINS
Check for any service bulletins.
>> GO TO 4
4.
CHECK DRIVE BELTS
Check A/C compressor belt tension. Refer to
Is the inspection result normal?
YES
>> GO TO 5
NO
>> Adjust or replace compressor belt. Refer to
5.
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 6
NO
>> Check air mix door motor circuit. Refer to
HAC-163, "Diagnosis Procedure"
.
6.
CHECK COOLING FAN MOTOR OPERATION
Check and verify cooling fan motor for smooth operation.
Does cooling fan motor operation correctly?
YES
>> GO TO 7
NO
>> Check cooling fan motor. Refer to
EC-463, "Component Function Check"
.
7.
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 8
8.
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 9
NO
>> Check contaminated refrigerant. Refer to
INSUFFICIENT COOLING
HAC-183
< SYMPTOM DIAGNOSIS >
[MANUAL AIR CONDITIONER]
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HAC
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9.
CHECK REFRIGERANT PRESSURE
Check refrigerant pressure with manifold gauge connected. Refer to
Is the inspection result normal?
YES
>> Perform diagnostic work flow. Refer to
NO
>> GO TO 10
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
.
NO
>> GO TO 11
11.
CHECK AIR DUCTS
Check ducts for air leaks.
Is the inspection result normal?
YES
>> System OK.
NO
>> Repair air leaks.
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