Infiniti G35 (V35) Sedan. Manual - part 747

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PRECAUTIONS

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.
• 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 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 to the manifold gauge.

SERVICE COUPLERS

RHA270DA

SHA533D

RHA272D

PRECAUTIONS

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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

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COMPRESSOR

COMPRESSOR

General Precautions

INFOID:0000000000959856

CAUTION:

• Plug all openings to prevent moisture and foreign matter from entering.
• When the compressor is removed, store it in the same way at it is when mounted on the car.
• When replacing or repairing compressor, follow “Maintenance of Lubricant Quantity in Compressor”

exactly. Refer to 

HA-30, "Adjustment"

.

• Keep friction surfaces between clutch and pulley clean. If the surface is contaminated with lubricant,

wipe it off by using a clean waste cloth moistened with thinner.

• After compressor service operation, turn the compressor shaft by hand more than five turns in both

directions. This will equally distribute lubricant inside the compressor. After the compressor is
installed, let the engine idle and operate the compressor for one hour.

• After replacing the compressor magnet clutch, apply voltage to the new one and check for normal

operation.

LEAK DETECTION DYE

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LEAK DETECTION DYE

General Precautions

INFOID:0000000000959857

CAUTION:

• 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.

• Always wear fluorescence enhancing UV safety goggles to protect your eyes and enhance the visi-

bility of the fluorescent dye.

• The fluorescent dye leak detector is not a replacement for an electrical leak detector (SST: J-41995).

The fluorescent dye leak detector should be used in conjunction with an electrical leak detector
(SST: J-41995) to pin-point refrigerant leaks.

• For the purpose of safety and customer’s satisfaction, read and follow all manufacture’s operating

instructions and precautions prior to performing the work.

• A compressor shaft seal should not necessarily be repaired because of dye seepage. The compres-

sor shaft seal should only be repaired after confirming the leak with an electrical leak detector (SST:
J-41995).

• Always remove any remaining dye from the leak area after repairs are completed to avoid a misdiag-

nosis during a future service.

• Never 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.

• Never spray the fluorescent dye cleaning agent on hot surfaces (engine exhaust manifold, etc.).
• Never use more than one refrigerant dye bottle (1/4 ounce /7.4 cc) per A/C system.
• Leak detection dyes for HFC-134a (R-134a) and CFC-12 (R-12) A/C systems are different. Never use

HFC-134a (R-134a) leak detection dye in CFC-12 (R-12) A/C system, or CFC-12 (R-12) leak detection
dye in HFC-134a (R-134a) A/C system, or A/C system damage may result.

• The fluorescent properties of the dye will remain for three years or a little over 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 the identification label on the front side of hood.