Nissan Murano Z50 (2005 year). Manual - part 3

PRECAUTIONS

ATC-9

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Revision: 2005 August

2005 Murano

REMOVAL

1.

Clean piping connection point, and set a disconnector.

2.

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

3.

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

1.

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

2.

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

3.

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 point is thin. So, when inserting male-side piping, take care not
to deform female-side piping. Slowly insert it in axial direction.

●

Insert piping securely until a click is heard.

SJIA0106E

SJIA0107E

ATC-10

PRECAUTIONS

Revision: 2005 August

2005 Murano

●

After piping connection is completed, pull male-side piping by hand to make sure connection
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 chance 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

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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 will leak at, or
around, the connection.

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

2

16

Low-pressure pipe 2 to expansion valve

92473 N8210

1

16

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

92471 N8221

2

8

High-pressure pipe 2 to expansion valve

92471 N8210

1

8

Condenser to high-pressure flexible hose

92472 N8210

1

12

Condenser to high-pressure pipe 1

92471 N8210

1

8

Low-pressure flexible hose to low-pressure pipe 1

92474 N8210

1

19

Compressor to low-pressure flexible hose

92474 N8210

1

19

Compressor to high-pressure flexible hose

92472 N8210

1

12

Liquid tank to condenser pipe

Inlet

92471 N8210

1

8

Outlet

1

Former

Refrigerant pressure sensor to condenser

J2476 89956

1

10

Expansion valve to evaporator

Inlet

92475 71L00

1

12

Outlet

92475 72L00

1

16

ATC-12

PRECAUTIONS

Revision: 2005 August

2005 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 as 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 dirt 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 tube, 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 dented portion 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 until snug. 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.

Lubricant name

: Nissan A/C System Oil Type S

Part number

: KLH00-PAGS1P

RHA861F

PRECAUTIONS

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Precautions for Servicing Compressor

AJS000YC

●

Plug all openings to prevent moisture and foreign matter from entering.

●

When the compressor is removed, store it in the same way as 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

AJS000YD

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.

●

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: 2005 August

2005 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

Close

RHA273D

RHA274D

PRECAUTIONS

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Precautions for Leak Detection Dye

AJS000YE

●

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

●

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

●

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 (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 this identification
label on the front side of hood.

SHA436FA

ATC-16

PREPARATION

Revision: 2005 August

2005 Murano

PREPARATION

PFP:00002

Special Service Tools

AJS000YG

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

(J-44614)
Clutch disc wrench

Removing shaft nut and clutch disc

KV99233130
(J-29884)
Pulley  puller

Removing pulley

KV99234330
(J-38873)
Pulley installer

Installing pulley

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

RJIA1875E

RJIA1876E

RJIA1877E

SJIA1274E

PREPARATION

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

AJS001FH

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 will occur and
compressor malfunction will 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

KLH00-PAGS1P
( - )
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 leak detector

Power supply:
DC 12 V (Battery terminal)

S-NT196

S-NT197

WJIA0293E

AHA281A

ATC-18

PREPARATION

Revision: 2005 August

2005 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

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Commercial Service Tools

AJS001FI

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: 2005 August

2005 Murano

REFRIGERATION SYSTEM

PFP:KA990

Refrigerant Cycle

AJS000YJ

REFRIGERANT FLOW

The refrigerant flows in the standard pattern, that is, through the compressor, the condenser with liquid tank,
through the evaporator, and back to the compressor. The refrigerant evaporation through 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
display and A/C auto amp. will make the A/C relay go OFF and stop the compressor.

Refrigerant System Protection

AJS000YK

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

2

 , 398 psi), or below about 134 kPa

(1.4 kg/cm

2

 , 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

2

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

RJIA1745E

REFRIGERATION SYSTEM

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Component Layout

AJS000YM

RJIA1746E

ATC-22

LUBRICANT

Revision: 2005 August

2005 Murano

LUBRICANT

PFP:KLG00

Maintenance of Lubricant Quantity in Compressor

AJS000YN

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.

1. 

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

OK

>> GO TO 2.

NG

>> GO TO 3.

2. 

PERFORM LUBRICANT RETURN OPERATION, PROCEEDING AS FOLLOWS:

1.

Start engine, and set 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)

2.

Perform lubricant return operation for about 10 minutes.

3.

Stop engine.

>> GO TO 3.

3. 

CHECK REPLACEMENT PART

Should the compressor be replaced?

YES

>> GO TO 

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

MENT"

 .

NO

>> GO TO 

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

MENT EXCEPT COMPRESSOR"

 .

Name

: Nissan A/C System Oil Type S

Part number

: KLH00-PAGS1P

LUBRICANT

ATC-23

C

D

E

F

G

H

I

K

L

M

A

B

ATC

Revision: 2005 August

2005 Murano

LUBRICANT ADJUSTING PROCEDURE FOR COMPONENTS REPLACEMENT EXCEPT COM-
PRESSOR

After replacing any of the following major components, add the correct amount of lubricant to the system.
Amount of lubricant to be added

*1: If refrigerant leak is small, no addition of lubricant is needed.

LUBRICANT ADJUSTING PROCEDURE FOR COMPRESSOR REPLACEMENT

1.

Before connecting recovery/recycling recharging equipment to vehicle, check recovery/recycling recharg-
ing equipment gauges. No refrigerant pressure should be displayed. If NG, recover refrigerant from equip-
ment lines.

2.

Connect recovery/recycling recharging equipment to vehicle. Confirm refrigerant purity in supply tank
using recovery/recycling recharging equipment and refrigerant identifier. If NG, refer to 

ATC-6, "CONTAM-

INATED REFRIGERANT"

 .

3.

Confirm refrigerant purity in vehicle A/C system using recovery/recycling recharging equipment and refrig-
erant identifier. If NG, refer to 

ATC-6, "CONTAMINATED REFRIGERANT"

 .

4.

Discharge refrigerant into the refrigerant recovery/recycling equipment. Measure lubricant discharged into
the recovery/recycling equipment.

5.

Drain the lubricant from the old (removed) compressor into a graduated container and recover the amount
of lubricant drained.

6.

Drain the lubricant from the new compressor into a separate, clean container.

7.

Measure an amount of new lubricant installed equal to amount drained from old compressor. Add this
lubricant to new compressor through the suction port opening.

8.

Measure an amount of new lubricant equal to the amount recovered during discharging. Add this lubricant
to new compressor through the suction port opening.

9.

If the liquid tank also needs to be replaced, add another 5 m  (0.2 US fl oz., 0.2 Imp fl oz.) of lubricant at
this time.
Do not add this 5 m  (0.2 US fl oz., 0.2 Imp fl oz.) of lubricant only when replaces the compressor.

Part replaced

Lubricant to be added to system

Remarks

Amount of lubricant

m

 (US fl oz., Imp fl oz.)

Evaporator

75 (2.5, 2.6)

—

Condenser

35 (1.2, 1.2)

—

Liquid tank

10 (0.3, 0.4)

—

In case of refrigerant leak

30 (1.0, 1.1)

Large leak

—

Small leak

*1

  

ATC-24

LUBRICANT

Revision: 2005 August

2005 Murano

RJIA3578E