Nissan Pathfinder (2011 year). Instruction - part 437

 

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Nissan Pathfinder (2011 year). Instruction - 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

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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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