Nissan Pathfinder (2008 year). Manual — part 426

PRECAUTIONS

HA-11

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The oil contained inside the vacuum pump is not compatible with the
specified oil for HFC-134a (R-134a) A/C systems. The vent side of
the vacuum pump is exposed to atmospheric pressure so the vac-
uum pump oil may migrate out of the pump into the service hose.
This is possible when the pump is switched off after evacuation (vac-
uuming) and hose is connected to it.
To prevent this migration, use a manual valve situated near the
hose-to-pump connection, as follows.
• Usually vacuum pumps have a manual isolator valve as part of the

pump. Close this valve to isolate the service hose from the pump.

• For pumps without an isolator, use a hose equipped with a manual

shut-off valve near the pump end. Close the valve to isolate the
hose from the pump.

• If the hose has an automatic shut off valve, disconnect the hose

from the pump: as long as the hose is connected, the valve is open
and lubricating oil may migrate.

Some one-way valves open when vacuum is applied and close
under a no vacuum condition. Such valves may restrict the pump's
ability to pull a deep vacuum and are not recommended.

MANIFOLD GAUGE SET

Be certain that the gauge face indicates HFC-134a (R-134a). Make
sure the gauge set has 1/2

″

-16 ACME threaded connections for ser-

vice hoses. Confirm the set has been used only with refrigerant
HFC-134a (R-134a) along with specified oil.

SERVICE HOSES

Be certain that the service hoses display the markings described
(colored hose with black stripe). All hoses must include positive shut-
off devices (either manual or automatic) near the end of the hoses
opposite the manifold gauge.

SERVICE COUPLERS

RHA270D

SHA533D

RHA272D

HA-12

< PRECAUTION >

PRECAUTIONS

Never attempt to connect HFC-134a (R-134a) service couplers to a
CFC-12 (R-12) A/C system. The HFC-134a (R-134a) couplers will
not properly connect to the CFC-12 (R-12) system. If an improper
connection is attempted, discharging and contamination may occur.

REFRIGERANT WEIGHT SCALE

Verify that no refrigerant other than HFC134a (R-134a) and specified
oils have been used with the scale. If the scale controls refrigerant
flow electronically, the hose fitting must be 1/2”-16 ACME.

CHARGING CYLINDER

Using a charging cylinder is not recommended. Refrigerant may be vented into air from cylinder's top valve
when filling the cylinder with refrigerant. Also, the accuracy of the cylinder is generally less than that of an
electronic scale or of quality recycle/recharge equipment.

Shut-off valve rotation

A/C service valve

Clockwise

Open

Counterclockwise

Close

RHA273D

RHA274D

PREPARATION

HA-13

< PREPARATION >

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PREPARATION

PREPARATION

Special Service Tool

INFOID:0000000001675587

The actual shapes of Kent-Moore tools may differ from those of special service tools illustrated here.

HFC-134a (R-134a) Service Tool and Equipment

INFOID:0000000001675588

Never mix HFC-134a (R-134a) refrigerant and/or its specified oil with CFC-12 (R-12) refrigerant and/or its oil.
Separate and non-interchangeable service equipment must be used for handling each type of refrigerant/oil.
Refrigerant container fittings, service hose fittings and service equipment fittings (equipment which handles
refrigerant and/or oil) are different between CFC-12 (R-12) and HFC-134a (R-134a). This is to avoid mixed
use of the refrigerants/oil.
Adapters that convert one size fitting to another must never be used refrigerant/oil contamination will occur
and compressor failure will result.

Tool number
(Kent-Moore No.)
Tool name

Description

—

(J-38873-A)
Pulley installer

Installing pulley

KV99233130
(J-29884)
Pulley puller

Removing pulley

LHA171

LHA172

Tool number
(Kent-Moore No.)
Tool name

Description

HFC-134a (R-134a)
(

—

)

Refrigerant

Container color: Light blue
Container marking: HFC-134a (R-
134a)
Fitting size: Thread size
• large container 1/2”-16 ACME

—

(

—

)

NISSAN A/C System Oil Type S

Type: Poly alkylene glycol oil (PAG),
type S
Application: HFC-134a (R-134a)
swash plate compressors (NISSAN
only)

Lubricity: 40 m

(1.4 US fl oz, 1.4 Imp

fl oz)

S-NT196

S-NT197

HA-14

< PREPARATION >

PREPARATION

KV991J0130
(ACR2005-NI)
ACR A/C Service Center

Refrigerant Recovery and Recycling
and Recharging

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(J-41995)
Electronic refrigerant leak detector

Power supply:
• DC 12V (battery terminal)

—

(J-43926)
Refrigerant dye leak detection kit
Kit includes:
(J-42220)
UV lamp and UV safety goggles
(J-41459)
Refrigerant dye injector
(J-41447)
Fluorescent leak detection dye
(box of 24, 1/4 ounce bottles)
(J-43872)
Refrigerant dye cleaner

Power supply:
• DC 12V (battery terminal)

—

(J-42220)
Fluorescent dye leak detector

Power supply:
• DC 12V (battery terminal)
For checking refrigerant leak when flu-
orescent dye is installed in A/C system.
Includes: UV lamp and UV safety gog-
gles

—

(J-41447)
HFC-134a (R-134a) Fluorescent
leak detection dye
(Box of 24, 1/4 ounce bottles)

Application: For HFC-134a (R-134a)
PAG oil
Container: 1/4 ounce (7.4cc) bottle
(Includes self-adhesive dye identifica-
tion labels for affixing to vehicle after
charging system with dye.)

—

(J-41459)
HFC-134a (R-134a) Refrigerant
dye injector
Use with J-41447, 1/4 ounce bottle

For injecting 1/4 ounce of fluorescent
leak detection dye into A/C system.

Tool number
(Kent-Moore No.)
Tool name

Description

WJIA0293E

AHA281A

ZHA200H

SHA438F

SHA439F

SHA440F

PREPARATION

HA-15

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Commercial Service Tool

INFOID:0000000001675589

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(J-43872)
Refrigerant dye cleaner

For cleaning dye spills.

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(J-39183-C)
Manifold gauge set (with hoses
and couplers)

Identification:
• The gauge face indicates R-134a.

Fitting size-Thread size

• 1/2”-16 ACME

Service hoses:
• High side hose

(J-39500-72B)

• Low side hose

(J-39500-72R)

• Utility hose

(J-39500-72Y)

Hose color:
• Low side hose: Blue with black stripe
• High side hose: Red with black stripe
• Utility hose: Yellow with black stripe

or green with black stripe
Hose fitting to gauge:

• 1/2”-16 ACME

Service couplers
• High side coupler

(J-39500-20A)

• Low side coupler

(J-39500-24A)

Hose fitting to service hose:
• M14 x 1.5 fitting is optional or perma-

nently attached.

—

(J-39699)
Refrigerant weight scale

For measuring of refrigerant
Fitting size-Thread size
• 1/2”-16 ACME

—

(J-39649)
Vacuum pump
(Including the isolator valve)

Capacity:
• Air displacement: 4 CFM
• Micron rating: 20 microns
• Oil capacity: 482 g (17 oz)

Fitting size-Thread size

• 1/2”-16 ACME

Tool number
(Kent-Moore No.)
Tool name

Description

SHA441F

RJIA0196E

S-NT201

S-NT202

S-NT200

S-NT203

HA-16

< PREPARATION >

PREPARATION

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

REFRIGERATION SYSTEM

HA-17

< FUNCTION DIAGNOSIS >

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FUNCTION DIAGNOSIS

REFRIGERATION SYSTEM

Component

INFOID:0000000001675590

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

HA-18

< FUNCTION DIAGNOSIS >

REFRIGERATION SYSTEM

Front A/C Compressor and Condenser - VK56DE

AWIIA0570GB

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

P.

Refrigerant leak checking order (a - k)

Q.

Tightening torque

R.

Wrench size

S.

O-ring size

T.

Former type refrigerant connection

U.

New type refrigerant connection