Nissan Pathfinder (2006 year). Manual - part 44

PREPARATION

ATC-17

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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

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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

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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

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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.