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Nissan Murano Z50 (2007 year). Manual - part 175

REFRIGERANT LINES

ATC-135

ATC

Revision: 2006 July

2007 Murano

CAUTION:

●

Replace O-rings of low-pressure flexible hose and high-pressure flexible hose with new ones, and
then apply compressor oil to it when installing it.

●

When recharging refrigerant, check for leaks.

Check Disc to Pulley Clearance

NJS000IC

Check clearance around entire periphery of clutch disc.

If specified clearance is not obtained, replace compressor.

Removal and Installation of Low-pressure Flexible Hose

NJS000C1

REMOVAL

Use a refrigerant collecting equipment (for HFC-134a) to discharge the refrigerant.

Remove cowl top cover. Refer to

EI-20, "COWL TOP"

Remove air duct (inlet). Refer to

EM-16, "AIR CLEANER AND AIR DUCT"

Remove mounting bolt from low-pressure flexible hose. (Com-
pressor side)

CAUTION:

Cap or wrap the joint of low-pressure flexible hose and
compressor with suitable material such as vinyl tape to
avoid the entry of air.

Remove mounting bolt from low-pressure flexible hose.

Remove low-pressure flexible hose.

CAUTION:

Cap or wrap the joint of low-pressure flexible hose and low-
pressure pipe 1 with suitable material such as vinyl tape to
avoid the entry of air.

INSTALLATION

Installation is basically the reverse order of removal.

CAUTION:

●

Replace O-rings of low-pressure flexible hose with new ones, and then apply compressor oil to it
when installing it.

●

When recharging refrigerant, check for leaks.

Idler pulley bracket mounting bolts

: 28 N·m (2.9 kg-m, 21 ft-lb)

Disc to pulley
clearance

: 0.3 - 0.60 mm (0.012 - 0.024 in)

SJIA1167E

RJIA2986E

RJIA1851E

ATC-136

REFRIGERANT LINES

Revision: 2006 July

2007 Murano

Removal and Installation of High-pressure Flexible Hose

NJS000C2

REMOVAL

Use a refrigerant collecting equipment (for HFC-134a) to discharge the refrigerant.

Remove air duct (inlet). Refer to

EM-16, "AIR CLEANER AND AIR DUCT"

Remove mounting bolt from high-pressure flexible hose (Com-
pressor side), and then remove high-pressure flexible hose
mounting clip.

CAUTION:

Cap or wrap the joint of high-pressure flexible hose and
compressor with suitable material such as vinyl tape to
avoid the entry of air.

Remove mounting bolt from high-pressure flexible hose (Con-
denser side), and then remove high-pressure flexible hose.

CAUTION:

Cap or wrap the joint of high-pressure flexible hose and
condenser with suitable material such as vinyl tape to avoid
the entry of air.

INSTALLATION

Installation is basically the reverse order of removal.

CAUTION:

●

Replace O-rings of high-pressure flexible hose with new ones, and then apply compressor oil to it
when installing it.

●

When recharging refrigerant, check for leaks.

RJIA2988E

RJIA1853E

REFRIGERANT LINES

ATC-137

ATC

Revision: 2006 July

2007 Murano

Removal and Installation of Low-pressure Pipe 1 (Engine Compartment)

NJS000C3

REMOVAL

Use a refrigerant collecting equipment (for HFC-134a) to discharge the refrigerant.

Remove cowl top cover. Refer to

EI-20, "COWL TOP"

Remove mounting bolts from low-pressure pipe 1 and low-pres-
sure pipe 1 bracket.

Remove high-pressure pipe 1 from clip.

CAUTION:

Cap or wrap the joint of low-pressure pipe 1 and low-pres-
sure flexible hose with suitable material such as vinyl tape
to avoid the entry of air.

Disconnect one-touch joints.

Set a disconnector (SST: 9253089916) on A/C piping.

Slide a disconnector toward vehicle front until it clicks.

Slide A/C piping toward vehicle front and disconnect it.

Remove low-pressure pipe 1.

CAUTION:

Cap or wrap the joint of low-pressure pipe 1 and 2 with suit-
able material such as vinyl tape to avoid the entry of air.

INSTALLATION

Installation is basically the reverse order of removal.

CAUTION:

●

Replace O-rings of low-pressure pipe 1 and low-pressure flexible hose with new ones, and then
apply compressor oil to it when installing it.

●

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.

●

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

●

When recharging refrigerant, check for leaks.

RJIA1854E

PJIA0098E

Low-pressure pipe 1 bracket mounting bolt

: 4.2 N·m (0.43 kg-m, 37 in-lb)

ATC-138

REFRIGERANT LINES

Revision: 2006 July

2007 Murano

Removal and Installation of High-pressure Pipe 1 (Engine Compartment)

NJS000C4

REMOVAL

Remove low-pressure pipe 1. Refer to

ATC-137, "Removal and Installation of Low-pressure Pipe 1

(Engine Compartment)"

Remove radiator reservoir tank. Refer to

CO-13, "RADIATOR"

Remove IPDM E/R. Refer to

PG-28, "Removal and Installation of IPDM E/R"

Remove power steering oil tank mounting nuts.

Remove vehicle harness connector from bracket.

Remove high-pressure pipe 1 from clips.

Remove high-pressure flexible hose from vehicle clips.

Disconnect cooling fan connector.

Remove cooling fan harness clips from fan shroud.

10. Remove ground harness terminal mounting bolt.

11. Disconnect one-touch joint of high-pressure pipe 1.

Set a disconnector (SST: 9253089908) on A/C piping.

Slide a disconnector toward vehicle front until it clicks.

Slide A/C piping toward vehicle front and disconnect it.

CAUTION:

Cap or wrap the joint of high-pressure pipe 1 and 2 with
suitable material such as vinyl tape to avoid the entry of air.

12. Remove mounting bolt, and then remove high-pressure pipe 1.

CAUTION:

Cap or wrap the joint of high-pressure pipe 1 and con-
denser with suitable material such as vinyl tape to avoid the
entry of air.

INSTALLATION

Installation is basically the reverse order of removal.

RJIA1856E

RJIA1857E

RJIA1855E

RJIA1853E

REFRIGERANT LINES

ATC-139

ATC

Revision: 2006 July

2007 Murano

CAUTION:

●

Replace O-rings of high-pressure pipe 1 with new ones, and then apply compressor oil to it when
installing it.

●

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.

●

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

●

When recharging refrigerant, check for leaks.

Removal and Installation of Low-pressure Pipe 2 and High-pressure Pipe 2

NJS000C5

REMOVAL

Set the temperature control dial (passenger side) at 18

C (60

F), and then disconnect the battery cable

from the negative terminal.

Use a refrigerant collecting equipment (for HFC-134a) to discharge the refrigerant.

Remove cowl top cover. Refer to

EI-20, "COWL TOP"

Remove mounting bolt from low-pressure flexible pipe 1 bracket.

Remove high-pressure pipe 1 from vehicle clips.

Disconnect one-touch joints.

Set a disconnector [high-pressure side (SST: 9253089908), low-
pressure side (SST: 9253089916)] on A/C piping.

Slide a disconnector toward vehicle front until it clicks.

Slide A/C piping toward vehicle front and disconnect it.

CAUTION:

Cap or wrap the joint of low-pressure pipe 1, 2 and high-
pressure pipe 1, 2 with suitable material such as vinyl tape
to avoid the entry of air.

Remove blower unit. Refer to

ATC-112, "BLOWER UNIT"

Remove air mix door motor (passenger side), foot duct, heater core cover. Refer to

ATC-123, "AIR MIX

DOOR MOTOR"

ATC-129, "Removal of Foot Ducts"

and

ATC-124, "HEATER CORE"

Remove mounting screws, and then remove evaporator cover.

RJIA1858E

PJIA0098E

RJIA3992E

ATC-140

REFRIGERANT LINES

Revision: 2006 July

2007 Murano

10. Remove mounting bolt, and then remove low-pressure pipe 2

and high-pressure pipe 2.

CAUTION:

Cap or wrap the joint of evaporator, low-pressure pipe 2 and
high-pressure pipe 2 with suitable material such as vinyl
tape to avoid the entry of air.

INSTALLATION

Installation is basically the reverse order of removal.

CAUTION:

●

Replace O-rings of low-pressure pipe 1, 2 and high-pressure pipe 1, 2 with new ones, and then
apply compressor oil to it when installing it.

●

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.

●

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

●

When recharging refrigerant, check for leaks.

Removal and Installation of Liquid Tank

NJS000C6

REMOVAL

Remove condenser. Refer to

ATC-141, "Removal and Installation of Condenser"

Clean liquid tank and its surrounding area, and remove dust and rust from tank.

CAUTION:

Be sure to clean carefully.

Remove mounting bolts from liquid tank.

Lift liquid tank bracket upward. Remove liquid tank bracket from
protruding part of condenser.

Slide liquid tank upward, and then remove liquid tank.

RJIA1817E

Low-pressure pipe 1 bracket mounting bolt

: 4.2 N·m (0.43 kg-m, 37 in-lb)

RJIA1859E

RJIA1860E

REFRIGERANT LINES

ATC-141

ATC

Revision: 2006 July

2007 Murano

INSTALLATION

Install liquid tank, and then install liquid tank bracket on condenser.

CAUTION:

●

Make sure liquid tank bracket is securely installed at protru-
sion of condenser.

●

Make sure liquid tank bracket does not move to a position
below center of liquid tank.

●

Replace O-rings of condenser pipe with new ones, and then
apply compressor oil to it when installing it.

●

When recharging refrigerant, check for leaks.

Removal and Installation of Condenser

NJS000C7

REMOVAL

Use a refrigerant collecting equipment (for HFC-134a) to discharge the refrigerant.

Remove air duct (inlet). Refer to

EM-16, "AIR CLEANER AND AIR DUCT"

Remove engine undercover, using power tools.

Drain engine coolant. Refer to

CO-9, "Changing Engine Coolant"

Remove cooling fan shroud after removing radiator upper hose. Refer to

CO-13, "RADIATOR"

Remove mounting bolt, and then disconnect high-pressure flexi-
ble hose and high-pressure pipe 1.

CAUTION:

Cap or wrap the joint of condenser, high-pressure flexible
hose and high-pressure pipe 1 with suitable material such
as vinyl tape to avoid the entry of air.

Remove radiator upper mount, move radiator and condenser to
the engine side.

Remove mounting bolts, and then remove condenser.

CAUTION:

Be careful not to damage core surface of condenser and
radiator.

RJIA1861E

Liquid tank bracket (upper side) mounting bolt

: 3.4 N·m (0.34 kg-m, 30 in-lb)

Liquid tank bracket (lower side) mounting bolt

: 5.7 N·m (0.58 kg-m, 50 in-lb)

RJIA1853E

RJIA1862E

ATC-142

REFRIGERANT LINES

Revision: 2006 July

2007 Murano

INSTALLATION

Installation is basically the reverse order of removal.

CAUTION:

●

Replace O-rings of high-pressure flexible hose and high-pressure pipe 1 with new ones, and then
apply compressor oil to it when installing it.

●

When recharging refrigerant, check for leaks.

Removal and Installation of Refrigerant Pressure Sensor

NJS000C8

REMOVAL

Remove condenser. Refer to

ATC-141, "Removal and Installation of Condenser"

Remove refrigerant pressure sensor from condenser.

CAUTION:

When working, be careful not to damage the condenser.

INSTALLATION

Installation is basically the reverse order of removal.

CAUTION:

Apply compressor oil to O-ring of refrigerant pressure sensor when installing it.

Removal and Installation of Evaporator

NJS000C9

REMOVAL

Remove low-pressure pipe 2 and high-pressure pipe 2. Refer to

ATC-139, "Removal and Installation of

Low-pressure Pipe 2 and High-pressure Pipe 2"

CAUTION:

Cap or wrap the joint of evaporator, low-pressure pipe 1, 2 and high-pressure pipe 1, 2 with suit-
able material such as vinyl tape to avoid the entry of air.

Slide evaporator, and then remove it from heater & cooling unit
assembly.

Remove intake sensor from evaporator, and then remove evap-
orator.

Condenser mounting bolts

: 6.1 N·m (0.62 kg-m, 54 in-lb)

RJIA1863E

Refrigerant pressure sensor

: 10.8 N·m (1.1 kg-m, 8.0 ft-lb)

RJIA1808E

REFRIGERANT LINES

ATC-143

ATC

Revision: 2006 July

2007 Murano

INSTALLATION

Installation is basically the reverse order of removal.

CAUTION:

●

Replace O-rings of low-pressure pipe 1, 2 and high-pressure pipe 1, 2 with new ones, and then
apply compressor oil to it when installing it.

●

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.

●

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

●

O-rings are different from low-pressure pipe 1 (high-pressure pipe 1) and low-pressure pipe 2
(high-pressure pipe 2).

●

Mark the mounting position of intake sensor bracket prior to removal so that the reinstalled sen-
sor can be located in the same position.

●

When recharging refrigerant, check for leaks.

Removal and Installation of Expansion Valve

NJS000CA

REMOVAL

Remove evaporator. Refer to

ATC-142, "Removal and Installation of Evaporator"

Remove mounting bolts, and then remove expansion valve.

CAUTION:

Cap or wrap the joint of evaporator with suitable material
such as vinyl tape to avoid the entry of air.

INSTALLATION

Installation is basically the reverse order of removal.

CAUTION:

●

Replace O-rings of evaporator with new ones, and then apply compressor oil to it when installing
it.

●

O-rings are different from low-pressure pipe 1 (high-pressure pipe 1) and low-pressure pipe 2
(high-pressure pipe 2).

●

When recharging refrigerant, check for leaks.

Low-pressure pipe 1 bracket mounting bolt

: 4.2 N·m (0.43 kg-m, 37 in-lb)

RJIA1864E

Expansion valve mounting bolts

: 3.9 N·m (0.4 kg-m, 35 in-lb)

ATC-144

REFRIGERANT LINES

Revision: 2006 July

2007 Murano

Checking for Refrigerant Leaks

NJS000CB

Perform a visual inspection of all refrigeration parts, fittings, hoses and components for signs of A/C lubricant
leakage, damage and corrosion. A/C lubricant leakage may indicate an area of refrigerant leakage. Allow
extra inspection time in these areas when using either an electrical leak detector or fluorescent dye leak
detector (SST: J-42220).
If dye is observed, confirm the leak with an electrical leak detector. It is possible a prior leak was repaired and
not properly cleaned.
When searching for leaks, do not stop when one leak is found but continue to check for additional leaks at all
system components and connections.
When searching for refrigerant leaks using an electrical leak detector, move the probe along the suspected
leak area at 1 to 2 inches per second and no further than 1/4 inch from the component.

CAUTION:

Moving the electrical leak detector probe slower and closer to the suspected leak area will improve the
chances of finding a leak.

Checking System for Leaks Using the Fluorescent Leak Detector

NJS000CC

Check A/C system for leaks using the UV lamp and safety goggles (SST: J-42220) in a low sunlight area
(area without windows preferable). Illuminate all components, fittings and lines. The dye will appear as a
bright green/yellow area at the point of leakage. Fluorescent dye observed at the evaporator drain open-
ing indicates an evaporator core assembly (tubes, core or expansion valve) leak.

If the suspected area is difficult to see, use an adjustable mirror or wipe the area with a clean shop rag or
cloth, with the UV lamp for dye residue.

After the leak is repaired, remove any residual dye using dye cleaner (SST: J-43872) to prevent future
misdiagnosis.

Perform a system performance check and verify the leak repair with an approved electrical leak detector.

NOTE:
Other gases in the work area or substances on the A/C components, for example, anti-freeze, windshield
washer fluid, solvents and lubricants, may falsely trigger the leak detector. Make sure the surfaces to be
checked are clean.
Clean with a dry cloth or blow off with shop air.
Do not allow the sensor tip of the detector to contact with any substance. This can also cause false readings
and may damage the detector.

Dye Injection

NJS000CD

(This procedure is only necessary when recharging the system or when the compressor has seized and was
replaced.)

Check A/C system static (at rest) pressure. Pressure must be at least 345 kPa (3.52 kg/cm

, 50 psi).

Pour one bottle (1/4 ounce / 7.4 cc) of the A/C refrigerant dye into the injector tool (SST: J-41459).

Connect the injector tool to the A/C low-pressure side service valve.

Start the engine and switch A/C ON.

When the A/C operating (compressor running), inject one bottle (1/4 ounce / 7.4 cc) of fluorescent dye
through the low-pressure service valve using dye injector tool (SST: J-41459) (refer to the manufacture’s
operating instructions).

With the engine still running, disconnect the injector tool from the service valve.

CAUTION:

Be careful the A/C system or replacing a component, pour the dye directly into the open system
connection and proceed with the service procedures.

Operate the A/C system for a minimum of 20 minutes to mix the dye with the system oil. Depending on the
leak size, operating conditions and location of the leak, it may take from minutes to days for the dye to
penetrate a leak and become visible.

Attach a blue label as necessary.

REFRIGERANT LINES

ATC-145

ATC

Revision: 2006 July

2007 Murano

Electrical Leak Detector

NJS000CE

PRECAUTIONS FOR HANDLING LEAK DETECTOR

When performing a refrigerant leak check, use an A/C electrical leak
detector (SST) or equivalent. Ensure that the instrument is calibrated
and set properly per the operating instructions.
The leak detector is a delicate device. In order to use the leak detec-
tor properly, read the operating instructions and perform any speci-
fied maintenance.

Position probe approximately 5 mm (3/16 in) away from point to
be checked.

When testing, circle each fitting completely with probe.

Move probe along component approximately 25 to 50 mm (1 to
2 in)/sec.

SHA196FA

SHA707EA

SHA706E

SHA708EA

ATC-146

REFRIGERANT LINES

Revision: 2006 July

2007 Murano

CHECKING PROCEDURE

To prevent inaccurate or false readings, make sure there is no refrigerant vapor, shop chemicals, or cigarette
smoke in the vicinity of the vehicle. Perform the leak test in calm area (low air/wind movement) so that the
leaking refrigerant is not dispersed.

Stop the engine.

Connect a suitable A/C manifold gauge set (SST: J-39183) to the A/C service valves.

Check if the A/C refrigerant pressure is at least 345 kPa (3.52 kg/cm

, 50 psi) above 16

C (61

F). If less

than specification, recover/evacuate and recharge the system with the specified amount of refrigerant.

NOTE:
At temperatures below 16

C (61

F), leaks may not be detected since the system may not reach 345 kPa

(3.52 kg/cm

, 50 psi).

Perform the leak test from the high-pressure side (compressor discharge a to evaporator inlet g) to the
low-pressure side (evaporator drain hose h to shaft seal m). Refer to

ATC-133, "Components"

. Perform a

leak check for the following areas carefully. Clean the component to be checked and move the leak
detected probe completely around the connection/component.
Compressor
Check the fitting of high- and low-pressure flexible hoses, relief valve and shaft seal.
Condenser
Check the fitting of high-pressure flexible hose and pipe, refrigerant pressure sensor.
Liquid tank
Check the fitting of refrigerant connection.
Service valves
Check all around the service valves. Ensure service valve caps are secured on the service valves (to pre-
vent leaks).

NOTE:
After removing A/C manifold gauge set from service valves, wipe any residue from valves to prevent any
false readings by leak detector.
Cooling unit (Evaporator)
With engine OFF, turn blower fan on “High” for at least 15 seconds to dissipate any refrigerant trace in the
cooling unit. Wait a minimum of 10 minutes accumulation time (refer to the manufacturer’s recommended
procedure for actual wait time) before inserting the leak detector probe into the drain hose.
Keep the probe inserted for at least 10 seconds. Use caution not to contaminate the probe tip with water
or dirt that may be in the drain hose.

If a leak detector detects a leak, verify at least once by blowing compressed air into area of suspected
leak, then repeat check as outlined above.

Do not stop when one leak is found. Continue to check for additional leaks at all system components.
If no leaks are found, perform steps 7 - 10.

Start the engine.

Set the A/C control as follows;

A/C switch: ON

MODE door position: VENT (Ventilation)

Intake door position: Recirculation

Temperature setting: Max cold

Fan speed: High

Run engine at 1,500 rpm for at least 2 minutes.

REFRIGERANT LINES

ATC-147

ATC

Revision: 2006 July

2007 Murano

10. Stop the engine and perform leak check again following steps 4

through 6 above.
Refrigerant leaks should be checked immediately after stopping
the engine. Begin with the leak detector at the compressor. The
pressure on the high-pressure side will gradually drop after
refrigerant circulation stops and pressure on the low-pressure
side will gradually rise, as shown in the graph. Some leaks are
more easily detected when pressure is high.

11. Before connecting recovery/recycling recharging equipment to vehicle, check recovery/recycling recharg-

ing equipment gauges. No refrigerant pressure should be displayed. If pressure is displayed, recover
refrigerant from equipment lines and then check refrigerant purity.

12. Confirm refrigerant purity in supply tank using recovery/recycling recharging equipment and refrigerant

identifier.

13. Confirm refrigerant purity in vehicle A/C system using recovery/recycling recharging equipment and refrig-

erant identifier.

14. Discharge A/C system using approved refrigerant recovery equipment. Repair the leaking fitting or com-

ponent if necessary.

15. Evacuate and recharge A/C system and perform the leak test to confirm no refrigerant leaks.

16. Perform A/C performance test to ensure system works properly.

SHA839E