Content .. 165 166 167 168 ..

Nissan Murano Z50 (2007 year). Manual - part 167

PRECAUTIONS

ATC-7

ATC

Revision: 2006 July

2007 Murano

General Refrigerant Precautions

NJS000A4

WARNING:

●

Avoid breathing A/C refrigerant and lubricant vapor or mist. Exposure may irritate eyes, nose and
throat. Remove HFC-134a (R-134a) from the A/C system, using certified service equipment meet-
ing requirements of SAEJ-2210 [HFC-134a (R-134a) recycling equipment], or J-2209 [HFC-134a (R-
134a) recovery equipment]. If accidental system discharge occurs, ventilate work area before
resuming service. Additional health and safety information may be obtained from refrigerant and
lubricant manufacturers.

●

Never release refrigerant into the air. Use approved recovery/recycling equipment to capture the
refrigerant every time an air conditioning system is discharged.

●

Always wear eye and hand protection (goggles and gloves) when working with any refrigerant or
air conditioning system.

●

Never store or heat refrigerant containers above 52

C (126

F).

●

Never heat a refrigerant container with an open flame; if container warming is required, place the
bottom of the container in a warm pail of water.

●

Never intentionally drop, puncture, or incinerate refrigerant containers.

●

Keep refrigerant away from open flames: poisonous gas will be produced if refrigerant burns.

●

Refrigerant will displace oxygen, therefore be certain to work in well ventilated areas to prevent
suffocation.

●

Never pressure test or leak test HFC-134a (R-134a) service equipment and/or vehicle air condition-
ing systems with compressed air during repair. Some mixtures of air and HFC-134a (R-134a) have
been shown to be combustible at elevated pressures. These mixtures, if ignited, may cause injury
or property damage. Additional health and safety information may be obtained from refrigerant
manufacturers.

ATC-8

PRECAUTIONS

Revision: 2006 July

2007 Murano

Precautions for Refrigerant Connection

NJS000A6

A new type refrigerant connection has been introduced to all refrigerant lines except the following location.

●

Expansion valve to evaporator

●

Refrigerant pressure sensor to condenser

ABOUT ONE-TOUCH JOINT
Description

●

One-touch joints are pipe joints which do not require tools during piping connection.

●

Unlike conventional connection methods using union nuts and flanges, controlling tightening torque at
connection point is not necessary.

●

When removing a pipe joint, use a disconnector.

COMPONENT PARTS

FUNCTIONS OF COMPONENT PARTS

NOTE:

●

Garter spring (2) cannot be removed from cage (A) of male-side piping.

●

Indicator ring (3) remains near piping connection point, however, this is not a malfunction. (This is to
check piping connection during factory assembly.)

Pipe (Male side)

●

Retains O-rings (4).

●

Retains garter spring (2) in cage (A).

Garter spring

Anchors female side piping (5).

Indicator ring

When connection is made properly, this is ejected from male-side piping (1). (This part is no longer
necessary after connection.)

O-ring

Seals connection point. (Not reusable)

Pipe (Female side)

●

Seals connection by compressing O-rings (4).

●

Anchors piping connection using flare (B) and garter spring (2).

RJIA4383J

PRECAUTIONS

ATC-9

ATC

Revision: 2006 July

2007 Murano

REMOVAL

Clean piping connection point, and set a disconnector.

Slide disconnector in axial direction of piping, and stretch garter spring with tapered point of disconnector.

Slide disconnector farther so that inside diameter of garter spring becomes larger than outside diameter of
female-side piping flare. Then male-side piping can be disconnected.

INSTALLATION

Clean piping connection points, and insert male-side piping into female-side piping.

Push inserted male-side piping harder so that female-side piping flare stretches garter spring.

If inside diameter of garter spring becomes larger than outside diameter of female-side piping flare, garter
spring seats on flare. Then, it fits in between male-side piping cage and female-side piping flare to anchor
piping connection point.

NOTE:
When garter spring seats on flare, and fits in between male-side piping cage and female-side piping flare,
it clicks.

CAUTION:

●

Female-side piping connection is thin and easy to deform. Slowly insert the male-side piping
straight in axial direction.

●

Insert piping securely until a click is heard.

SJIA0106E

SJIA0107E

ATC-10

PRECAUTIONS

Revision: 2006 July

2007 Murano

●

After piping connection is completed, pull male-side piping by hand to make sure that connec-
tion does not come loose.

NOTE:
One-touch joint connection is used in points below.

●

Low-pressure pipe 1 to low-pressure pipe 2 (O-ring size: 16)

●

High-pressure pipe 1 to high-pressure pipe 2 (O-ring size: 8)

FEATURES OF NEW TYPE REFRIGERANT CONNECTION

●

The O-ring has been relocated. It has also been provided with a groove for proper installation. This elimi-
nates the possibility of the O-ring being caught in, or damaged by, the mating part. The sealing direction of
the O-ring is now set vertically in relation to the contacting surface of the mating part to improve sealing
characteristics.

●

The reaction force of the O-ring will not occur in the direction that causes the joint to pull out, thereby facil-
itating piping connections.

SHA815E

PRECAUTIONS

ATC-11

ATC

Revision: 2006 July

2007 Murano

O-RING AND REFRIGERANT CONNECTION

CAUTION:

The new and former refrigerant connections use different O-ring configurations. Never confuse O-
rings since they are not interchangeable. If a wrong O-ring is installed, refrigerant may leak at the con-
nection.

O-Ring Part Numbers and Specifications

RJIA1744E

Connection type

Piping connection point

Part number

QTY

O-ring size

New

Low-pressure pipe 1 to low-pressure pipe 2 (One-touch joint)

92473 N8221

Low-pressure pipe 2 to expansion valve

92473 N8210

High-pressure pipe 1 to high-pressure pipe 2 (One-touch joint)

92471 N8221

High-pressure pipe 2 to expansion valve

92471 N8210

Condenser to high-pressure flexible hose

92472 N8210

Condenser to high-pressure pipe 1

92471 N8210

Low-pressure flexible hose to low-pressure pipe 1

92474 N8210

Compressor to low-pressure flexible hose

92474 N8210

Compressor to high-pressure flexible hose

92472 N8210

Liquid tank to condenser pipe

Inlet

92471 N8210

Outlet

Former

Refrigerant pressure sensor to condenser

J2476 89956

Expansion valve to evaporator

Inlet

92475 71L00

Outlet

92475 72L00

ATC-12

PRECAUTIONS

Revision: 2006 July

2007 Murano

WARNING:

Make sure all refrigerant is discharged into the recycling equipment and the pressure in the system is
less than atmospheric pressure. Then gradually loosen the discharge side hose fitting and remove it.

CAUTION:

When replacing or cleaning refrigerant cycle components, observe the following.

●

When the compressor is removed, store it in the same way at it is when mounted on the car. Fail-
ure to do so will cause lubricant to enter the low-pressure chamber.

●

When connecting tubes, always use a torque wrench and a back-up wrench.

●

After disconnecting tubes, immediately plug all openings to prevent entry of dust and moisture.

●

When installing an air conditioner in the vehicle, connect the pipes at the final stage of the opera-
tion. Never remove the seal caps of pipes and other components until just before required for con-
nection.

●

Allow components stored in cool areas to warm to working area temperature before removing seal
caps. This prevents condensation from forming inside A/C components.

●

Thoroughly remove moisture from the refrigeration system before charging the refrigerant.

●

Always replace used O-rings.

●

When connecting tubes, apply lubricant to circle of the O-rings shown in illustration. Be careful
not to apply lubricant to threaded portion.

●

O-ring must be closely attached to the groove of tube.

●

When replacing the O-ring, be careful not to damage O-ring and tube.

●

Connect tube until a click can be heard, then tighten the nut or bolt by hand. Make sure that the O-
ring is installed to tube correctly.

●

After connecting line, perform leak test and make sure that there is no leakage from connections.
When the refrigerant leaking point is found, disconnect that line and replace the O-ring. Then
tighten connections of seal seat to the specified torque.

Name

: Nissan A/C System Oil Type S

RHA861F

PRECAUTIONS

ATC-13

ATC

Revision: 2006 July

2007 Murano

Precautions for Servicing Compressor

NJS000A7

●

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 Compres-
sor” exactly. Refer to

ATC-22, "Maintenance of Lubricant Quantity in Compressor"

●

Keep friction surfaces between clutch and pulley clean. If the surface is contaminated with lubri-
cant, 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.

Precautions for Service Equipment

NJS000A8

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.

ELECTRICAL 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.

●

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 man-
ual 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.

RHA270DA

SHA533D

ATC-14

PRECAUTIONS

Revision: 2006 July

2007 Murano

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

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.

RHA272D

Shut-off valve rotation

A/C service valve

Clockwise

Open

Counterclockwise

RHA273D

RHA274D

PRECAUTIONS

ATC-15

ATC

Revision: 2006 July

2007 Murano

Precautions for Leak Detection Dye

NJS000A9

●

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 visibility 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 instruc-
tions and precautions prior to performing the work.

●

A compressor shaft seal should not necessarily be repaired because of dye seepage. The compressor
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 misdiagnosis
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 mal-
function 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.

ATC-16

PREPARATION

Revision: 2006 July

2007 Murano

PREPARATION

PFP:00002

Special Service Tools

NJS000AB

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

Tool number
(Kent-Moore No.)
Tool name

Description

9253089908
(for high-pressure pipe 1)
( - )
9253089912
(for high-pressure flexible hose)
( - )
9253089916
(for low-pressure pipe 1 and
low-pressure flexible hose)
( - )
Disconnector tool set
(J-45815)

Disconnect one-touch joint connection

SJIA1274E

PREPARATION

ATC-17

ATC

Revision: 2006 July

2007 Murano

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

NJS000AC

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.
Never use adapters that convert one size fitting to another: refrigerant/lubricant contamination occurs and
compressor malfunction may result.

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
(DH-PS)

Type: Polyalkylene glycol oil (PAG),
type S (DH-PS)
Application:
HFC-134a (R-134a) swash plate
compressors (Nissan only)

Capacity: 40 m

(1.4 US fl oz., 1.4

Imp fl oz.)

(ACR2005-NI)
ACR5 A/C Service Center

Function: Refrigerant recovery,
recycling and recharging

(J-41995)
Electrical A/C leak detector

Power supply:
DC 12 V (Battery terminal)

S-NT196

S-NT197

WJIA0293E

AHA281A

ATC-18

PREPARATION

Revision: 2006 July

2007 Murano

(J-43926)
Refrigerant dye leak detection kit
Kit includes:
(J-42220)
UV lamp and UV safety goggles
(J-41459)
HFC-134a (R-134a) dye injector
Use with J-41447, 1/4 ounce
bottle
(J-41447)
HFC-134a (R-134a) fluorescent
leak detection dye
(Box of 24, 1/4 ounce bottles)
(J-43872)
Refrigerant dye cleaner

Power supply:
DC 12 V (Battery terminal)

(J-42220)
UV lamp and UV safety goggles

Power supply:
DC 12 V (Battery terminal)
For checking refrigerant leak when
fluorescent dye is installed in A/C
system
Includes:
UV lamp and UV safety goggles

(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 (7.4 cc) bottle
(Includes self-adhesive dye
identification labels for affixing to
vehicle after charging system with
dye.)

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

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

(J-43872)
Refrigerant dye cleaner

For cleaning dye spills

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

Identification:

●

The gauge face indicates HFC-134a
(R-134a).

Fitting size: Thread size

●

1/2

″

-16 ACME

Tool number
(Kent-Moore No.)
Tool name

Description

ZHA200H

SHA438F

SHA439F

SHA440F

SHA441F

RJIA0196E

PREPARATION

ATC-19

ATC

Revision: 2006 July

2007 Murano

Commercial Service Tools

NJS000AD

Service hoses

●

High-pressure side hose
(J-39501-72)

●

Low-pressure side hose
(J-39502-72)

●

Utility hose
(J-39476-72)

Hose color:

●

Low hose: Blue with black stripe

●

High 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-pressure side coupler
(J-39500-20)

●

Low-pressure side coupler
(J-39500-24)

Hose fitting to service hose:
M14 x 1.5 fitting is optional or
permanently attached.

(J-39650)
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

S-NT201

S-NT202

S-NT200

S-NT203

Tool name

Description

Refrigerant identifier equipment

Checking for refrigerant purity and
system contamination

Power tool

For loosening bolts and nuts

RJIA0197E

PBIC0190E

ATC-20

REFRIGERATION SYSTEM

Revision: 2006 July

2007 Murano

REFRIGERATION SYSTEM

PFP:KA990

Refrigerant Cycle

NJS000AE

REFRIGERANT FLOW

The refrigerant flows from the compressor, through the condenser with liquid tank, through the evaporator, and
back to the compressor. The refrigerant evaporation in the evaporator is controlled by an externally equalized
expansion valve, located inside the evaporator case.

FREEZE PROTECTION

To prevent evaporator frozen up, the evaporator air temperature is monitored, and the voltage signal to the
unified meter and A/C amp. will make the A/C relay go OFF and stop the compressor.

Refrigerant System Protection

NJS000AF

REFRIGERANT PRESSURE SENSOR

The refrigerant system is protected against excessively high- or low-pressure by the refrigerant pressure sen-
sor, located on the condenser. If the system pressure rises above, or falls below the specifications, the refrig-
erant pressure sensor detects the pressure inside the refrigerant line and sends the voltage signal to the ECM.
ECM makes the A/C relay go OFF and stops the compressor when pressure on the high-pressure side
detected by refrigerant pressure sensor is over about 2,746 kPa (28 kg/cm

, 398 psi), or below about 134 kPa

(1.4 kg/cm

, 20 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 unusual level [more than 3,727 kPa (38 kg/cm

, 540 psi)], the release port on the pressure relief valve automatically opens and releases refrigerant into the
atmosphere.

RJIA1745E

REFRIGERATION SYSTEM

ATC-21

ATC

Revision: 2006 July

2007 Murano

Component Layout

NJS000AG

RJIA1746E

ATC-22

LUBRICANT

Revision: 2006 July

2007 Murano

LUBRICANT

PFP:KLG00

Maintenance of Lubricant Quantity in Compressor

NJS000AH

The lubricant in the compressor circulates through the system with the refrigerant. Add lubricant to compres-
sor when replacing any component or after a large refrigerant leakage occurred. It is important to maintain the
specified amount.
If lubricant quantity is not maintained properly, the following malfunctions may result:

●

Lack of lubricant: May lead to a seized compressor.

●

Excessive lubricant: Inadequate cooling (thermal exchange interference)

LUBRICANT

LUBRICANT RETURN OPERATION

Adjust the lubricant quantity according to the test group shown below.

CHECK LUBRICANT RETURN OPERATION

Can lubricant return operation be performed?

●

A/C system works properly.

●

There is no evidence of a large amount of lubricant leakage.

CAUTION:

If excessive lubricant leakage is noted, never perform the lubricant return operation.

OK or NG

>> GO TO 2.

>> GO TO 3.

PERFORM LUBRICANT RETURN OPERATION, PROCEEDING AS FOLLOWS

Start the engine, and set to the following conditions:

–

Engine speed: Idling to 1,200 rpm

–

A/C switch: ON

–

Blower speed: Max. position

–

Temp. control: Optional [Set so that intake air temperature is 25 to 30

C (77 to 86

F).]

–

Intake position: Recirculation (REC)

Perform lubricant return operation for about 10 minutes.

Stop the engine.

>> GO TO 3.

CHECK REPLACEMENT PART

Should the compressor be replaced?

YES

>> GO TO

ATC-23, "LUBRICANT ADJUSTING PROCEDURE FOR COMPRESSOR REPLACE-

MENT"

>> GO TO

ATC-23, "LUBRICANT ADJUSTING PROCEDURE FOR COMPONENTS REPLACE-

MENT EXCEPT COMPRESSOR"

Name

: NISSAN A/C System Oil Type S

Content .. 165 166 167 168 ..