Nissan Qashqai (2007-2010). Manual — part 872
HA-58
< BASIC INSPECTION >
[AUTOMATIC AIR CONDITIONER (K9K)]
DIAGNOSIS AND REPAIR WORKFLOW
BASIC INSPECTION
DIAGNOSIS AND REPAIR WORKFLOW
Work Flow
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DETAILED FLOW
1.
LISTEN TO CUSTOMER COMPLAINT
Listen to customer complaint. (Get detailed information about the conditions and environment when the symp-
tom occurs.)
>> GO TO 2.
2.
VERIFY THE SYMPTOM WITH OPERATIONAL CHECK
Verify the symptom with operational check. Refer to
HAC-6, "Description & Inspection"
>> GO TO 3.
3.
GO TO APPROPRIATE TROUBLE DIAGNOSIS
Go to appropriate trouble diagnosis (Refer to
HAC-108, "Diagnosis Chart By Symptom"
>> GO TO 4.
4.
REPAIR OR REPLACE
Repair or replace the specific parts
>> GO TO 5.
5.
FINAL CHECK
Final check.
Is the inspection result normal?
YES
>> CHECK OUT
NO
>> GO TO 3.
REFRIGERATION SYSTEM
HA-59
< FUNCTION DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER (K9K)]
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FUNCTION DIAGNOSIS
REFRIGERATION SYSTEM
System Diagram
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System Description
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REFRIGERANT CYCLE
Refrigerant Flow
The refrigerant flows from the compressor, through the condenser with liquid tank, through the evaporator, and
back to the compressor. The refrigerant evaporation in the evaporator is controlled by an externally equalized
expansion valve, located inside the evaporator case.
Freeze Protection
To prevent evaporator frozen up, the evaporator air temperature is monitored, and the voltage signal to the
display and A/C auto amp. will make the A/C relay go OFF and stop the compressor.
REFRIGERANT SYSTEM PROTECTION
Refrigerant Pressure Sensor
The refrigerant system is protected against excessively high- or low-pressures by the refrigerant pressure sen-
sor, located on the condenser. If the system pressure rises above, or falls below the specifications, the refrig-
erant pressure sensor detects the pressure inside the refrigerant line and sends the voltage signal to the ECM.
ECM makes the A/C relay go OFF and stops the compressor when pressure on the high-pressure side
detected by refrigerant pressure sensor is over about 3,119 kPa (31.8 kg/cm
2
, 452 psi), or below about 118
kPa (1.2 kg/cm
2
, 17 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 unusual level [more than 3,628 kPa (37 kg/
cm
2
, 526 psi)], the release port on the pressure relief valve automatically opens and releases refrigerant into
the atmosphere.
LUBRICANT
RJIA1552E
HA-60
< FUNCTION DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER (K9K)]
REFRIGERATION SYSTEM
Maintenance of Lubricant Quantity in Compressor
The lubricant in the compressor circulates through the system with the refrigerant. Add lubricant to compres-
sor when replacing any component or after a large refrigerant leakage occurred. It is important to maintain the
specified amount.
If lubricant quantity is not maintained properly, the following malfunctions may result:
• Lack of lubricant: May lead to a seized compressor.
• Excessive lubricant: Inadequate cooling (thermal exchange interference)
Lubricant
Component Parts Location
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Name
: Nissan A/C System Oil Type S
REFRIGERATION SYSTEM
HA-61
< FUNCTION DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER (K9K)]
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1.
Refrigerant pressure sensor
2.
Liquid tank
3.
Condenser
4.
Compressor
5.
Radiator
E1KIA0033ZZ
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