Nissan Pathfinder (2007 year). Manual - part 46

REFRIGERATION SYSTEM

ATC-19

C

D

E

F

G

H

I

K

L

M

A

B

ATC

2007 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

2007 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

C

D

E

F

G

H

I

K

L

M

A

B

ATC

2007 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

2007 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

C

D

E

F

G

H

I

K

L

M

A

B

ATC

2007 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

2007 Pathfinder

Do not add this 5 m  (0.2 US fl oz, 0.2 Imp fl oz) of oil if only replacing the compressor.

AIR CONDITIONER CONTROL

ATC-25

C

D

E

F

G

H

I

K

L

M

A

B

ATC

2007 Pathfinder

AIR CONDITIONER CONTROL

PFP:27500

Description

EJS004ON

The front air control provides automatic regulation of the vehicle's interior temperature. The system is based
on the driver's and passenger's selected "set temperature", regardless of the outside temperature changes.
This is done by utilizing a microcomputer, also referred to as the front air control, which receives input signals
from the following six sensors:

●

Ambient sensor

●

In-vehicle sensor

●

Intake sensor

●

Optical sensor (providing one input for driver and one input for passenger side)

●

PBR (Position Balanced Resistor)

●

Vehicle speed sensor

The front air control uses these signals (including the set temperature) to automatically control:

●

Outlet air volume

●

Air temperature

●

Air distribution

The front air control also provides separate regulation of the vehicle's interior temperature for the rear passen-
ger area. The system is based on the temperature and rear blower settings selected from rear control
switches located on the front air control, or from the temperature and rear blower settings selected from rear
control switches on the rear air control, when the front air control switches are set to the rear position.

The front air control is used to select: 

●

Outlet air volume

●

Air temperature/distribution

Operation

EJS004OO

AIR MIX DOORS CONTROL

The air mix doors are automatically controlled so that in-vehicle temperature is maintained at a predetermined
value by the temperature setting, ambient temperature, in-vehicle temperature and amount of sunload.

BLOWER SPEED CONTROL

Blower speed is automatically controlled by the temperature setting, ambient temperature, in-vehicle tempera-
ture, intake temperature, amount of sunload and air mix door position.
When AUTO switch is pressed, the blower motor starts to gradually increase air flow volume (if required).
When engine coolant temperature is low, the blower motor operation is delayed to prevent cool air from flow-
ing.

INTAKE DOOR CONTROL

The intake door is automatically controlled by the temperature setting, ambient temperature, in-vehicle tem-
perature, intake temperature, amount of sunload and the ON-OFF operation of the compressor.

MODE DOOR CONTROL

The mode door is automatically controlled by the temperature setting, ambient temperature, in-vehicle temper-
ature, intake temperature and amount of sunload.

DEFROSTER DOOR CONTROL

The defroster door is controlled by: Turning the defroster dial to front defroster.

ATC-26

AIR CONDITIONER CONTROL

2007 Pathfinder

MAGNET CLUTCH CONTROL

When A/C switch or DEF switch is pressed, front air control inputs compressor ON signal to BCM.
BCM sends compressor ON signal to ECM and front air control, via CAN communication line.
ECM judges whether compressor can be turned ON, based on each sensor status (refrigerant pressure sen-
sor signal, throttle angle sensor, etc.). If it judges compressor can be turned ON, it sends compressor ON sig-
nal to IPDM E/R, via CAN communication line.
Upon receipt of compressor ON signal from ECM, IPDM E/R turns air conditioner relay ON to operate com-
pressor.

SELF-DIAGNOSTIC SYSTEM

The self-diagnostic system is built into the front air control to quickly locate the cause of symptoms. Refer to

ATC-50, "A/C System Self-diagnosis Function"

 .

WJIA2144E