Nissan Qashqai (2007-2010). Manual — part 885
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HA-110
< FUNCTION DIAGNOSIS >
[MANUAL AIR CONDITIONER (HR/MR)]
REFRIGERATION SYSTEM
FUNCTION DIAGNOSIS
REFRIGERATION SYSTEM
System Diagram
INFOID:0000000001098129
System Description
INFOID:0000000001098130
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
REFRIGERATION SYSTEM
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< FUNCTION DIAGNOSIS >
[MANUAL AIR CONDITIONER (HR/MR)]
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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
INFOID:0000000001098131
Name
: Nissan A/C System Oil Type S
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HA-112
< FUNCTION DIAGNOSIS >
[MANUAL AIR CONDITIONER (HR/MR)]
REFRIGERATION SYSTEM
1.
Refrigerant pressure sensor
2.
Liquid tank
3.
Radiator
4.
Compressor
E1KIA0065ZZ
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REFRIGERATION SYSTEM
HA-113
< FUNCTION DIAGNOSIS >
[MANUAL AIR CONDITIONER (HR/MR)]
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Component Description
INFOID:0000000001098132
1.
Blower motor assembly
2.
Evaporator
3.
Intake sensor (AT only)
4.
Expansion valve
E1KIA0034ZZ
Component
Description
Compressor
Intakes, compresses, and discharges refrigerant, then conveys it to condenser.
Condenser
Condenses refrigerant, and then conveys it to liquid tank.
Liquid tank
Drives moisture out of refrigerant, eliminates foreign matter, then conveys refrigerant to expan-
sion valve.
Refrigerant pressure sensor
Refer to
HAC-161, "Component Inspection"
.
Expansion valve
Vaporizes refrigerant, controls the amount of flow, then conveys refrigerant to evaporator.
Evaporator
Cools passing air, and then conveys it to compressor.
Blower motor
Takes in air in the vehicle or fresh outside air, and then adjusts room temperature by air condi-
tioning.
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