Nissan Sentra. Manual — part 530
HA-14
< SYSTEM DESCRIPTION >
REFRIGERATION SYSTEM
Refrigerant Flow
The refrigerant from the compressor flows through the condenser and liquid tank, the evaporator and returns
to the compressor. The refrigerant evaporation in the evaporator is controlled by an expansion valve.
Freeze Protection
To prevent the evaporator from freezing up, the evaporator air temperature is monitored by the intake sensor
and the voltage signal to the A/C auto amp. makes the A/C relay go OFF and stop the compressor.
Refrigerant System Protection
INFOID:0000000009756291
Refrigerant pressure sensor
The refrigerant system is protected against excessively high or low pressures by the refrigerant pressure sen-
sor, located on the liquid tank. If the system pressure rises above or falls below the specifications, the refriger-
ant pressure sensor detects the pressure inside the refrigerant line and sends the voltage signal to the ECM.
The ECM then ceases to supply power to the A/C relay which disengages and stops the compressor when
pressure on the high pressure side (as detected by refrigerant pressure sensor) is over approximately 2,746
kPa (28 kg/cm
2
, 398 psi), or below approximately 120 kPa (1.22 kg/cm
2
, 17.4 psi).
Pressure Relief Valve
The refrigerant system is also protected by a pressure relief valve, located in the rear head of the compressor.
When the pressure of refrigerant in the system increases to an abnormal level [more than 3,727 kPa (38 kg/
cm
2
, 540 psi)], the release port on the pressure relief valve automatically opens and releases refrigerant into
the atmosphere.
1.
Electric compressor
2.
Pressure relief valve
3.
Liquid tank
4.
Refrigerant pressure sensor
5.
Condenser
6.
Expansion valve
7.
Evaporator
8.
Blower motor
A.
High-pressure gas
B.
High-pressure liquid
C.
Low-pressure liquid
D.
Low-pressure gas
E.
Suction port
F.
Discharge port
G.
Outside air
AWIIA1603ZZ
DIAGNOSIS AND REPAIR WORKFLOW
HA-15
< BASIC INSPECTION >
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BASIC INSPECTION
DIAGNOSIS AND REPAIR WORKFLOW
Workflow
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OVERALL SEQUENCE
DETAILED FLOW
1.
INTERVIEW CUSTOMER
Interview the customer to obtain as much information as possible about the conditions and environment under
which the malfunction occurred.
ALIIA0440GB
HA-16
< BASIC INSPECTION >
DIAGNOSIS AND REPAIR WORKFLOW
>> GO TO 2.
2.
SYMPTOM CHECK
Verify symptoms.
>> GO TO 3.
3.
CHECK FOR DTCS
With CONSULT
1. Turn ignition switch ON.
2. Select “Self Diagnostic Result” mode of “HVAC” using CONSULT.
3. Check DTC.
Is any DTC detected?
YES
>> GO TO 4.
NO
>> GO TO 5.
4.
PERFORM DTC DIAGNOSTIC PROCEDURE
Perform the diagnostic procedure for the detected DTC. Refer to
HAC-37, "DTC Inspection Priority Chart"
>> GO TO 7.
5.
OPERATION CHECK
Perform the operation check. Refer to
(manual A/C).
>> GO TO 6.
6.
SYMPTOM DIAGNOSIS
Check the symptom diagnosis table. Refer to
.
>> GO TO 8.
7.
VERIFY REPAIR.
With CONSULT
1. Turn ignition switch ON.
2. Select “Self Diagnostic Result” mode of “HVAC” using CONSULT.
3. Check DTC.
Is any DTC detected?
YES
>> GO TO 4.
NO
>> GO TO 8.
8.
PERFORM FINAL OPERATION CHECK
Perform the operation check. Refer to
(manual A/C).
Does it operate normally?
YES
>> Inspection End.
NO
>> GO TO 2.
HEATER AND AIR CONDITIONING SYSTEM SYMPTOMS
HA-17
< SYMPTOM DIAGNOSIS >
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SYMPTOM DIAGNOSIS
HEATER AND AIR CONDITIONING SYSTEM SYMPTOMS
Symptom Table
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SYMPTOM TABLE
Symptom
Reference Page
A/C system does not come on.
Go to Trouble Diagnosis Procedure for A/C System.
(automatic A/C)
(manual A/C)
A/C system cannot be controlled.
Go to Self-diagnosis Function.
(automatic A/C)
(manual A/C)
Air outlet does not change.
Go to Trouble Diagnosis Procedure for Mode Door
Motor.
(automatic A/C)
(manual A/C)
Mode door motor is malfunctioning.
Discharge air temperature does not change.
Go to Trouble Diagnosis Procedure for Air Mix Door
Motor.
(automatic A/C driver
side)
(automatic A/C passen-
ger side)
(manual A/C)
Air mix door motor is malfunctioning.
Intake door does not change.
Go to Trouble Diagnosis Procedure for Intake Door
Motor.
(automatic A/C)
(manual A/C)
Intake door motor is malfunctioning.
Blower motor operation is malfunctioning.
Go to Trouble Diagnosis Procedure for Blower Mo-
tor.
(automatic A/C)
(manual A/C)
Magnet clutch does not engage.
Go to Trouble Diagnosis Procedure for Magnet
Clutch.
(automatic A/C)
(manual A/C)
Insufficient cooling.
Go to Trouble Diagnosis Procedure for Insufficient
Cooling.
(automatic A/C)
(manual A/C)
Insufficient heating.
Go to Trouble Diagnosis Procedure for Insufficient
Heating.
(automatic A/C)
(manual A/C)
Noise.
Go to Trouble Diagnosis Procedure for Noise.
A/C switch LED does not illuminate.
Go to Trouble Diagnosis Procedure for A/C System.
(automatic A/C)
(manual A/C)
Mode button LED(s) does not illuminate.
Go to Trouble Diagnosis Procedure for A/C System.
(automatic A/C)
(manual A/C)
Both high- and low-pressure sides are too
high.
Go to Trouble Diagnosis Procedure for Abnormal
Pressure.
High-pressure side is too high and low-pres-
sure side is too low.
Go to Trouble Diagnosis Procedure for Abnormal
Pressure.
High-pressure side is too low and low-pres-
sure side is too high.
Go to Trouble Diagnosis Procedure for Abnormal
Pressure.
Both high- and low-pressure side some-
times becomes negative.
Go to Trouble Diagnosis Procedure for Abnormal
Pressure.
Low-pressure side sometimes becomes
negative.
Go to Trouble Diagnosis Procedure for Abnormal
Pressure.
Low-pressure side becomes negative.
Go to Trouble Diagnosis Procedure for Abnormal
Pressure.
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