Infiniti M45 (Y34). Manual — part 131

PRECAUTIONS

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ATC

Precautions for Service Equipment

AJS0006X

RECOVERY/RECYCLING EQUIPMENT

Be certain to follow the manufacturer’s instructions for machine operation and machine maintenance. Never
introduce any refrigerant other than that specified into the machine.

ELECTRONIC LEAK DETECTOR

Be certain to follow the manufacturer’s instructions for tester operation and tester maintenance.

VACUUM PUMP

The lubricant contained inside the vacuum pump is not compatible
with the specified lubricant for HFC-134a (R-134a) A/C systems.
The vent side of the vacuum pump is exposed to atmospheric pres-
sure. So the vacuum pump lubricant may migrate out of the pump
into the service hose. This is possible when the pump is switched off
after evacuation (vacuuming) and hose is connected to it.
To prevent this migration, use a manual valve placed near the hose-
to-pump connection, as follows.

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Usually vacuum pumps have a manual isolator valve as part of
the pump. Close this valve to isolate the service hose from the
pump.

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For pumps without an isolator, use a hose equipped with a man-
ual shut-off valve near the pump end. Close the valve to isolate
the hose from the pump.

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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 or R-134a. Be
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) and specified lubricants.

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.

RHA270DA

SHA533D

RHA272D

ATC-10

PRECAUTIONS

SERVICE COUPLERS

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. However, if an
improper connection is attempted, discharging and contamination
may occur.

REFRIGERANT WEIGHT SCALE

Verify that no refrigerant other than HFC-134a (R-134a) and speci-
fied lubricants 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

PRECAUTIONS

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Precautions for Leak Detection Dye

AJS0006Y

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The A/C system contains a fluorescent leak detection dye used for locating refrigerant leaks. An ultraviolet
(UV) lamp is required to illuminate the dye when inspecting for leaks.

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Always wear fluorescence enhancing UV safety goggles to protect your eyes and enhance the visibility of
the fluorescent dye.

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The fluorescent dye leak detector is not a replacement for an electronic refrigerant leak detector. The fluo-
rescent dye leak detector should be used in conjunction with an electronic refrigerant leak detector to (J-
41995) pin-point refrigerant leaks.

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For your safety and your Customer's satisfaction, read and follow all manufacture's operating instructions
and precautions prior to performing the work.

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A compressor shaft seal should not be repaired because of dye seepage. The compressor shaft seal
should only be repaired after confirming the leak with an electronic refrigerant leak detector (J-41995).

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Always remove any remaining dye from the leak area after repairs are complete to avoid a misdiagnosis
during a future service.

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Do not allow dye to come into contact with painted body panels or interior components. If dye is spilled,
clean immediately with the approved dye cleaner. Fluorescent dye left on a surface for an extended period
of time cannot be removed.

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Do not spray the fluorescent dye cleaning agent on hot surfaces (engine exhaust manifold, etc.).

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Do not use more than one refrigerant dye bottle (1/4 ounce /7.4 cc) per A/C system.

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Leak detection dyes for HFC-134a (R-134a) and CFC-12 (R-12) A/C systems are different. Do not use
HFC-134a (R-134a) leak detection dye in CFC-12 (R-12) A/C system or CFC-12 (R-12) leak detector dye
in HFC-134a (R-134a) A/C system or A/C system damage may result.

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The fluorescent properties of the dye will remain for over three (3) years unless a compressor malfunction
occurs.

IDENTIFICATION

NOTE:
Vehicles with factory installed fluorescent dye have a green label.
Vehicles without factory installed fluorescent dye have a blue label.

IDENTIFICATION LABEL FOR VEHICLE

Vehicles with factory installed fluorescent dye have this identification
label on the front side of hood.

Wiring Diagrams and Trouble Diagnosis

AJS00070

When you read wiring diagrams, refer to the following:

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GI-14, "How to Read Wiring Diagrams"

in GI section.

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PG-3, "Wiring Diagram — POWER —"

in PG section.

When you perform trouble diagnosis, refer to the following:

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GI-10, "How to Follow Trouble Diagnoses"

in GI section.

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GI-26, "How to Perform Efficient Diagnosis for an Electrical Incident"

in GI section.

SHA436FA

ATC-12

PREPARATION

PREPARATION

PFP:00002

Special Service Tools

AJS000VL

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

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

AJS000VM

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

Tool number
(Kent-Moore No.)
Tool name

Description

KV99106100
(J-41260)
Clutch disc wrench

Removing shaft nut and clutch disc

KV99232340
(J-38874)

Removing clutch disc

KV99106200
(J-41261)
Pulley installer

Installing pulley

S-NT232

RJIA0194E

S-NT376

S-NT235