Nissan Pathfinder (2006 year). Instruction — part 44
PREPARATION
ATC-17
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D
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F
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A
B
ATC
2006 Pathfinder
Commercial Service Tools
EJS004OI
Tool name
Description
(J-41810-NI)
Refrigerant identifier equipment (R-
134a)
For checking refrigerant purity and
system contamination
Power tool
Loosening bolts and nuts
(J-44614)
Clutch disc holding tool
Clutch disc holding tool
RJIA0197E
PBIC0190E
WHA230
ATC-18
REFRIGERATION SYSTEM
2006 Pathfinder
REFRIGERATION SYSTEM
PFP:KA990
Components
EJS004OJ
FRONT REFRIGERATION SYSTEM
WJIA1260E
REFRIGERATION SYSTEM
ATC-19
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ATC
2006 Pathfinder
REAR REFRIGERATION SYSTEM
1.
Defroster nozzle
2.
LH side demister duct
3.
LH ventilator duct
4.
RH side demister duct
5.
RH ventilator duct
6.
Center ventilator duct
7.
Front heater and cooling unit assembly
8.
Floor connector duct grilles
9.
Floor connector duct
10. Front floor ducts
11.
Rear floor ducts
1.
Side rear floor duct
2.
Rear heater and cooling unit assembly
3.
Rear lower overhead duct
4.
Rear upper overhead duct
LJIA0156E
ATC-20
REFRIGERATION SYSTEM
2006 Pathfinder
Refrigerant Cycle
EJS004OK
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.
WJIA1342E
REFRIGERATION SYSTEM
ATC-21
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ATC
2006 Pathfinder
Refrigerant System Protection
EJS004OL
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.
ATC-22
OIL
2006 Pathfinder
OIL
PFP:KLG00
Maintenance of Oil Quantity in Compressor
EJS004OM
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.
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)
OIL
Oil name: NISSAN A/C System Oil Type S or equivalent
CHECKING AND ADJUSTING
CAUTION:
If excessive oil leakage is noted, do not perform the oil return operation.
Start the engine and set the following conditions:
Test Conditions
●
Engine speed: idling to 1,200 rpm
●
A/C switch: ON
●
Blower fan speed: HIGH
●
Temperature control: optional [set so intake air temperature is 25
°
to 30
°
C (77
°
to 86
°
F)]
●
Intake position: RECIRCULATION mode
●
Perform oil return operation for about ten minutes
Adjust the oil quantity according to the following table.
Oil Adjusting Procedure for Components Replacement Except Compressor
After replacing any of the following major components, add the correct amount of oil to the system.
Amount of Oil to be Added
*1:
If refrigerant leak is small, no addition of oil is needed.
Part replaced
Oil to be added to system
Remarks
Amount of oil
m
(US fl oz, Imp fl oz)
Front evaporator
75 (2.5, 2.6)
—
Rear evaporator
75 (2.5, 2.6)
—
Condenser
75 (2.5, 2.6)
—
Liquid tank
5 (0.2, 0.2)
Add if compressor is not replaced.
In case of refrigerant leak
30 (1.0, 1.1)
Large leak
—
Small leak *1
OIL
ATC-23
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ATC
2006 Pathfinder
Oil Adjustment Procedure for Compressor Replacement
1.
Before connecting recovery/recycling equipment to vehicle, check recovery/recycling equipment gauges.
No refrigerant pressure should be displayed. If NG, recover refrigerant from equipment lines.
2.
Connect recovery/recycling equipment to vehicle. Confirm refrigerant purity in supply tank using recovery/
recycling equipment and refrigerant identifier. If NG, refer to
ATC-5, "Contaminated Refrigerant"
3.
Confirm refrigerant purity in vehicle A/C system using recovery/recycling equipment and refrigerant identi-
fier. If NG, refer to
ATC-5, "Contaminated Refrigerant"
4.
Discharge refrigerant into the refrigerant recovery/recycling equipment. Measure oil discharged into the
recovery/recycling equipment.
5.
Drain the oil from the “old” (removed) compressor into a graduated container and recover the amount of
oil drained.
6.
Drain the oil from the “new” compressor into a separate, clean container.
7.
Measure an amount of new oil installed equal to amount drained from “old” compressor. Add this oil to
“new” compressor through the suction port opening.
8.
Measure an amount of new oil equal to the amount recovered during discharging. Add this oil to “new”
compressor through the suction port opening.
9.
If the liquid tank also needs to be replaced, add an additional 5 m (0.2 US fl oz, 0.2 Imp fl oz) of oil at this
time.
1.
New compressor
2.
Old compressor
3.
Recovery/recycling equipment
4.
Measuring cup X
5.
Measuring cup Y
6.
New oil
A.
Drain oil from the new compressor
into clean container
B.
Record amount of oil recovered
C.
Add an additional 5 m
(0.2 US fl oz,
0.2 Imp fl oz) of new oil when replac-
ing liquid tank
D.
Install new oil equal to recorded
amounts in measuring cups X plus Y
WJIA1716E
ATC-24
OIL
2006 Pathfinder
Do not add this 5 m (0.2 US fl oz, 0.2 Imp fl oz) of oil if only replacing the compressor.
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