Nissan Quest E52. Instruction — part 706
SYSTEM
HA-15
< SYSTEM DESCRIPTION >
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The refrigerant from the compressor, flows the condenser with liquid tank, the evaporator, and returns to the
compressor. The refrigerant evaporation in the evaporator is controlled by an expansion valve.
Freeze Protection
When evaporator fin temperature is low, compressor stops so that freeze of evaporator can be prevented.
• Refer to
HAC-19, "FRONT AUTOMATIC AIR CONDITIONING SYSTEM : Compressor Control"
air conditioning)
• Refer to
HAC-163, "FRONT MANUAL AIR CONDITIONING SYSTEM : Compressor Control"
conditioning)
REFRIGERANT SYSTEM PROTECTION
Refrigerant Pressure Sensor
• The refrigerant system is protected against excessively high- or low-pressures by the refrigerant pressure
sensor, installed at the upper liquid tank. The refrigerant pressure sensor detects the pressure inside the
refrigerant line and sends the voltage signal to the ECM if the system pressure rises above, or falls below
the specifications.
• ECM turns the A/C relay to OFF and stops the compressor when the high-pressure side detected by refriger-
ant pressure sensor is following conditions;
- Approximately 3,120 kPa (31.8 kg/cm
2
, 452 psi) or more (Engine speed is less than 1,500 rpm.)
- Approximately 2,740 kPa (27.9 kg/cm
2
, 397 psi) or more (Engine speed is 1,500 rpm or more.)
- Approximately 140 kPa (1.4 kg/cm
2
, 20 psi) or less
Pressure Relief Valve
The refrigerant system is also protected by a pressure relief valve, located in the rear head of the compressor.
The release port on the pressure relief valve automatically opens and releases refrigerant into the atmosphere
when the pressure of refrigerant in the system increases to an unusual level [more than 3,800 kPa (38.8 kg/
cm
2
, 551 psi)].
HA-16
< BASIC INSPECTION >
DIAGNOSIS AND REPAIR WORKFLOW
BASIC INSPECTION
DIAGNOSIS AND REPAIR WORKFLOW
Work Flow
INFOID:0000000009651562
OVERALL SEQUENCE
DETAILED FLOW
1.
INTERVIEW FOR MALFUNCTION
Interview the symptom to the customer.
NNIIA0143GB
DIAGNOSIS AND REPAIR WORKFLOW
HA-17
< BASIC INSPECTION >
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>> GO TO 2.
2.
SYMPTOM CHECK
Check the symptom from the customer's information. Check that any symptom occurs other than the inter-
viewed symptom.
Insufficient cooling/heating>>GO TO 3.
Refrigerant leakage>>GO TO 6.
Noise >> GO TO 7.
3.
CONTROL SYSTEM DIAGNOSIS
Perform the system diagnosis for the A/C control system.
• Refer to
. (Automatic air conditioning)
• Refer to
. (Instruction air conditioning)
Is A/C control system normal?
YES
>> GO TO 4.
NO
>> GO TO 8.
4.
PERFORMANCE TEST
Perform the performance test. Check the operation of each part. Refer to
>> GO TO 5.
5.
TROUBLE DIAGNOSIS FOR UNUSUAL PRESSURE
Diagnose using a manifold gauge whenever system's high and/or low side pressure(s) is/are unusual. Specify
the malfunctioning part. Refer to
.
Low refrigerant charge>>GO TO 6.
Except above>>GO TO 8.
6.
CHECK REFRIGERANT FOR LEAKAGES
Check refrigerant for leakages. Specify the malfunctioning part. Refer to
.
>> GO TO 8.
7.
TROUBLE DIAGNOSIS FOR NOISE
Perform trouble diagnosis for noise. Specify the malfunctioning part. Refer to
>> GO TO 8.
8.
MALFUNCTION PART REPAIR
Repair or replace the malfunctioning part.
>> GO TO 9.
9.
REPAIR CHECK (OPERATION CHECK)
Check the operation of each part.
Does it operate normally?
YES
>> INSPECTION END
NO
>> GO TO 2.
HA-18
< BASIC INSPECTION >
REFRIGERANT
REFRIGERANT
Description
INFOID:0000000009651563
CONNECTION OF SERVICE TOOLS AND EQUIPMENT
Leak Test
INFOID:0000000009651564
CHECK REFRIGERANT LEAKAGE USING FLUORESCENT LEAK DETECTION DYE
1.
Install a fender cover (1).
2.
Wear UV safety goggles (2) provided with refrigerant dye leak detection kit.
3.
Connect power cable (4) of UV lamp (6) to positive and negative terminals of the battery (3).
4.
Press UV lamp switch (5) and check A/C system for refrigerant leakage. (Where refrigerant leakage
occurs, fluorescent leak detection dye appears in green color.)
WARNING:
1.
Shut-off valve
2.
A/C service valve
3.
Recovery/recycling/recharging
equipment
4.
Refrigerant container (HFC-134a)
5.
Weight scale (J-39650)
6.
Vacuum pump (J-39649)
7.
Manifold gauge set (J-39183)
A.
Preferred (best) method
B.
Alternative method
C.
For charging
JSIIA0239ZZ
RJIA3815J
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