Nissan Pathfinder (2011 year). Manual — part 437
PREPARATION
HA-17
< PREPARATION >
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(Kent-Moore Tool No.)
Tool name
Description
(J-41810-NI)
Refrigerant identifier equipment (R-
134a)
For checking refrigerant purity and
system contamination
—
Power tool
Loosening bolts, screws and nuts
RJIA0197E
PIIB1407E
2011 Pathfinder
HA-18
< SYSTEM DESCRIPTION >
REFRIGERATION SYSTEM
SYSTEM DESCRIPTION
REFRIGERATION SYSTEM
Component
INFOID:0000000006243585
CAUTION:
The new and former refrigerant connections use different O-ring configurations. Do not confuse O-
rings since they are not interchangeable. If a wrong O-ring is installed, refrigerant will leak at or
around the connection.
FRONT REFRIGERATION SYSTEM
2011 Pathfinder
REFRIGERATION SYSTEM
HA-19
< SYSTEM DESCRIPTION >
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Front A/C Compressor and Condenser - VK56DE
AWIIA1537GB
1.
High-pressure service valve
2.
Clip
3.
Front high-pressure A/C pipe
4.
Refrigerant pressure sensor
5.
Condenser
6.
Compressor shaft seal
7.
Front high-pressure flexible A/C hose
8.
Front low-pressure flexible A/C hose 9.
Low-pressure service valve
10. Front low-pressure A/C pipe
11. Front expansion valve
12. Front A/C drain hose
Vehicle front
2011 Pathfinder
HA-20
< SYSTEM DESCRIPTION >
REFRIGERATION SYSTEM
Front A/C Compressor and Condenser - VQ40DE
REAR REFRIGERATION SYSTEM
AWIIA1538GB
1.
High-pressure service valve
2.
Clip
3.
Front high-pressure A/C pipe
4.
Refrigerant pressure sensor
5.
Condenser
6.
Compressor shaft seal
7.
Front high-pressure flexible A/C hose
8.
Front low-pressure flexible A/C hose 9.
Low-pressure service valve
10. Front low-pressure A/C pipe
11. Front expansion valve
12. Front A/C drain hose
Vehicle front
2011 Pathfinder
REFRIGERATION SYSTEM
HA-21
< SYSTEM DESCRIPTION >
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Rear A/C
AWIIA1539GB
1.
Rear high- and low-pressure A/C pipes
2.
Rear heater core hoses
3.
Underfloor rear high- and low-pres-
sure A/C and heater core pipes
4.
Rear expansion valve
5.
Rear drain hose
Vehicle front
2011 Pathfinder
HA-22
< SYSTEM DESCRIPTION >
REFRIGERATION SYSTEM
Refrigerant Cycle
INFOID:0000000006243586
REFRIGERANT FLOW
The refrigerant flows in the standard pattern, that is, through the compressor, the condenser with liquid tank,
through the front and rear evaporators, and back to the compressor. The refrigerant evaporation through the
evaporator coils are controlled by front and rear externally equalized expansion valves, located inside the front
and rear evaporator cases.
FREEZE PROTECTION
The compressor cycles on and off to maintain the evaporator temperature within a specified range. When the
evaporator coil temperature falls below a specified point, the intake sensor interrupts the compressor opera-
tion. When the evaporator coil temperature rises above the specification, the intake sensor allows compressor
operation.
AWIIA1517ZZ
1.
Pressure relief valve
2.
Compressor
3.
Condenser
4.
Refrigerant pressure sensor
5.
Front blower motor
6.
Front evaporator and expansion valve assembly
7.
Liquid tank
8.
Rear expansion valve
9.
Rear evaporator
10. Rear blower motor
A.
High-pressure gas
B.
High-pressure liquid
C.
Low-pressure liquid
D.
Low-pressure gas
E.
Outside air
2011 Pathfinder
REFRIGERATION SYSTEM
HA-23
< SYSTEM DESCRIPTION >
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Refrigerant System Protection
INFOID:0000000006243587
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 refriger-
ant pressure sensor detects the pressure inside the refrigerant line and sends a voltage signal to the ECM.
The ECM de-energizes the A/C relay to disengage the magnetic compressor clutch when pressure on the high
pressure side detected by refrigerant pressure sensor is over about 2,746 kPa (28 kg/cm
2
, 398 psi), or below
about 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 2,990 kPa (30.5 kg/
cm
2
, 433.6 psi)], the release port on the pressure relief valve automatically opens and releases refrigerant into
the atmosphere.
2011 Pathfinder
HA-24
< SYSTEM DESCRIPTION >
OIL
OIL
Maintenance of Oil Quantity in Compressor
INFOID:0000000006243588
The oil in the compressor circulates through the system with the refrigerant. Add oil to compressor when
replacing any component or after a large refrigerant leakage has occurred. It is important to maintain the spec-
ified amount.
Oil name: NISSAN A/C System Oil Type S or equivalent
If oil quantity is not maintained properly, the following malfunctions may result:
• Lack of oil: May lead to a seized compressor
• Excessive oil: Inadequate cooling (thermal exchange interference)
2011 Pathfinder
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