Index Manuals Nissan Murano Z50 (2004 year) - Service and Repair Manual

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Nissan Murano Z50 (2004 year). Manual - part 11

REFRIGERANT LINES

ATC-137

ATC

Revision: 2004 November

2004 Murano

Removal and Installation of High-Pressure Flexible Hose

AJS0010S

REMOVAL

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

Remove the air duct (inlet). Refer to

EM-14, "AIR CLEANER AND AIR DUCT"

Remove the mounting bolt for high-pressure flexible hose (Com-
pressor side), and then remove high-pressure flexible hose fix-
ing clip.

Remove the mounting nut for high-pressure flexible hose (Con-
denser side), and then remove the high-pressure flexible hose.

CAUTION:

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

INSTALLATION

Installation is basically the reverse order of removal.

CAUTION:

●

Replace the O-ring of the high-pressure flexible hose with a new one, and then apply compressor
oil to it when installing it.

●

When recharging refrigerant, check for leaks.

RJIA1852E

RJIA1853E

ATC-138

REFRIGERANT LINES

Revision: 2004 November

2004 Murano

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

AJS0010B

REMOVAL

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

Remove cowl top cover. Refer to

EI-21, "COWL TOP"

Remove mounting bolt for low-pressure pipe 1 and low-pressure
pipe 1 bracket.

Remove high-pressure pipe 1 from clip.

Disconnect one-touch joints.

Set a disconnector (92530-89916) on A/C piping.

Slide a disconnector toward vehicle front until it clicks.

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

Remove the low-pressure pipe 1.

CAUTION:

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

INSTALLATION

Installation is basically the reverse order of removal.

CAUTION:

●

Replace the O-ring of the low-pressure pipe 1 with a new one, then apply compressor oil to it when
installing it.

●

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

●

Insert one-touch joint connection point securely until it clicks.

●

After piping has been connected, pull male-side piping by hand to make sure piping does not
come off.

●

When recharging refrigerant, check for leaks.

RJIA1854E

RJIA1815E

Bolt mounting the low-pressure pipe 1 bracket

Tightening torque

: 4.2 N·m (0.43 kg-m, 37 in-lb)

REFRIGERANT LINES

ATC-139

ATC

Revision: 2004 November

2004 Murano

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

AJS0010T

REMOVAL

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

Remove cowl top cover. Refer to

EI-21, "COWL TOP"

Remove air duct (inlet). Refer to

EM-14, "AIR CLEANER AND AIR DUCT"

Remove low-pressure pipe 1. Refer to

ATC-138, "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-29, "Removal and Installation of IPDM E/R"

Remove power steering oil tank mounting nuts.

Remove vehicle harness connector from bracket.

Remove the high-pressure pipe 1 from clips.

10. Remove the high-pressure flexible hose from vehicle clips.

11. Disconnect cooling fan connector.

12. Remove cooling fan harness clip from fan shroud.

13. Remove ground harness terminal mounting bolt.

14. Disconnect one-touch joints of high-pressure pipe 1.

Set a disconnector (92530-89908) 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 the pipe with suitable material such
as vinyl tape to avoid the entry of air.

15. Remove the high-pressure pipe 1 mounting bolt, and then

remove it.

CAUTION:

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

RJIA1856E

RJIA1857E

RJIA1855E

RJIA1853E

ATC-140

REFRIGERANT LINES

Revision: 2004 November

2004 Murano

INSTALLATION

Installation is basically the reverse order of removal.

CAUTION:

●

Replace the O-ring of the high-pressure pipe 1 with a new one, and then apply compressor oil to it
when installing it.

●

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

●

Insert one-touch joint connection point securely until it clicks.

●

After piping has been connected, pull male-side piping by hand to make sure piping does not
come off.

●

When recharging refrigerant, check for leaks.

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

AJS0010D

REMOVAL

Set the temperature at 18

C (60

F), and then disconnect the battery negative cable.

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

Remove cowl top cover. Refer to

EI-21, "COWL TOP"

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

Remove high-pressure pipe 1 from vehicle clips.

Disconnect one-touch joints.

Set a disconnector (High-pressure side: 92530-89908, Low-
pressure side: 92530-89916) 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 the pipe with suitable material such
as vinyl tape to avoid the entry of air.

Remove blower unit. Refer to

ATC-113, "BLOWER UNIT"

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

RJIA1858E

RJIA1815E

RJIA1816E

REFRIGERANT LINES

ATC-141

ATC

Revision: 2004 November

2004 Murano

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

CAUTION:

Cap or wrap the joint of the pipe 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 for A/C piping with new ones, and then apply compressor oil to it when installing
it.

●

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

●

Insert one-touch joint connection point securely until it clicks.

●

After piping has been connected, pull male-side piping by hand to make sure piping does not
come off.

●

When recharging refrigerant, check for leaks.

RJIA1817E

Bolt mounting low-pressure pipe 1 bracket

Tightening torque

: 4.2 N·m (0.43 kg-m, 37 in-lb)

ATC-142

REFRIGERANT LINES

Revision: 2004 November

2004 Murano

Removal and Installation of Liquid Tank

AJS0010E

REMOVAL

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

Remove condenser. Refer to

ATC-143, "Removal and Installation of Condenser"

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

CAUTION:

Be sure to clean carefully.

Remove mounting bolt for liquid tank.

Lift liquid tank bracket upwards. Remove bracket from protrud-
ing part of condenser.

Slide liquid tank upward, and then remove liquid tank.

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 for A/C piping with new ones, then apply
compressor oil to it when installing it.

●

When recharging refrigerant, check for leaks.

RJIA1859E

RJIA1860E

RJIA1861E

Bolt mounting the liquid tank bracket (upper side)

Tightening torque

: 3.4 N·m (0.34 kg-m, 30 in-lb)

Bolt mounting the liquid tank bracket (lower side)

Tughtening torque

: 5.7 N·m (0.58 kg-m, 50 in-lb)

REFRIGERANT LINES

ATC-143

ATC

Revision: 2004 November

2004 Murano

Removal and Installation of Condenser

AJS0010U

REMOVAL

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

Remove air duct (inlet). Refer to

EM-14, "AIR CLEANER AND

AIR DUCT"

Remove engine undercover, using power tools.

Drain engine coolant. Refer to

CO-9, "Changing Engine Cool-

ant"

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

CO-13, "RADIATOR"

Disconnect high-pressure flexible hose and high-pressure pipe
1.

CAUTION:

Cap or wrap the joint of the pipe 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 for condenser, and then remove con-
denser.

CAUTION:

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

INSTALLATION

Installation is basically the reverse order of removal.

CAUTION:

●

Replace O-rings for A/C piping with new ones, then apply compressor oil to it when installing it.

●

When recharging refrigerant, check for leaks.

RJIA1847E

RJIA1853E

RJIA1862E

Bolt mounting the condenser

Tightening torque

: 6.1 N·m (0.62 kg-m, 54 in-lb)

ATC-144

REFRIGERANT LINES

Revision: 2004 November

2004 Murano

Removal and Installation of Refrigerant Pressure Sensor

AJS0010G

REMOVAL

Remove the condenser. Refer to

ATC-143, "Removal and Installation of Condenser"

Remove the refrigerant pressure sensor from condenser.

CAUTION:

When working, be careful not to damage the condenser
fins.

INSTALLATION

Installation is basically the reverse order of removal.

CAUTION:

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

Removal and Installation of Evaporator

AJS0010V

REMOVAL

Set the temperature at 18

C (60

F), and then disconnect the battery negative cable.

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

Remove the cowl top cover. Refer to

EI-21, "COWL TOP"

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

ATC-140, "Removal and Installation of

Low-Pressure Pipe 2 and High-Pressure Pipe 2"

CAUTION:

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

Slide the evaporator, and then remove it from the heater & cool-
ing unit.

Remove the intake sensor from the evaporator, then remove the
evaporator.

RJIA1863E

Refrigerant pressure sensor

Tightening torque

: 10.8 N·m (1.1 kg-m, 8.0 ft-lb)

RJIA1808E

REFRIGERANT LINES

ATC-145

ATC

Revision: 2004 November

2004 Murano

INSTALLATION

Installation is basically the reverse order of removal.

CAUTION:

●

Replace O-rings for A/C piping with new ones, and then apply compressor oil to it when installing
it.

●

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

●

Insert one-touch joint connection point securely until it clicks.

●

After piping has been connected, pull male-side piping by hand to make sure piping does not
come off.

●

The 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 the intake sensor bracket.

●

When recharging refrigerant, check for leaks.

Removal and Installation of Expansion Valve

AJS0010W

REMOVAL

Set the temperature at 18

C (60

F), and then disconnect the battery negative cable.

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

Remove cowl top cover. Refer to

EI-21, "COWL TOP"

Remove evaporator. Refer to

ATC-144, "Removal and Installation of Evaporator"

Remove mounting bolts for expansion valve, and then remove
expansion valve.

INSTALLATION

Installation is basically the reverse order of removal.

CAUTION:

●

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

●

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

●

Insert one-touch joint connection point securely until it clicks.

●

After piping has been connected, pull male-side piping by hand to make sure piping does not
come off.

●

The 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.

Bolt mounting low-pressure pipe 1 bracket

Tightening torque

: 4.2 N·m (0.43 kg-m, 37 in-lb)

RJIA1864E

Bolt mounting expansion valve

Tightening torque

: 3.9 N·m (0.4 kg-m, 35 in-lb)

ATC-146

REFRIGERANT LINES

Revision: 2004 November

2004 Murano

Checking for Refrigerant Leaks

AJS0010J

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 electronic refrigerant leak detector or fluorescent
dye leak detector.
If dye is observed, confirm the leak with an electronic refrigerant 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 electronic 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 electronic 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

AJS0010K

Check A/C system for leaks using the UV lamp and safety goggles (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 opening indi-
cates 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 (J-43872) to prevent future misdiag-
nosis.

Perform a system performance check and verify the leak repair with an approved electronic refrigerant
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

AJS0010L

(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 (J-41459).

Connect the injector tool to the A/C LOW PRESSURE side service fitting.

Start 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 J-41459 (refer to the manufacture

′

s operat-

ing instructions).

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

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.

REFRIGERANT LINES

ATC-147

ATC

Revision: 2004 November

2004 Murano

Electronic Refrigerant Leak Detector

AJS0010M

PRECAUTIONS FOR HANDLING LEAK DETECTOR

When performing a refrigerant leak check, use a J-41995 A/C leak
detector 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-148

REFRIGERANT LINES

Revision: 2004 November

2004 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.

Turn engine OFF.

Connect a suitable A/C manifold gauge set to the A/C service ports.

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 side (compressor discharge a to evaporator inlet g) to the low side
(evaporator drain hose h to shaft seal m). Refer to

ATC-131, "Components"

. Perform a leak check for the

following areas carefully. Clean the component to be checked and move the leak detected probe com-
pletely around the connection/component.
Compressor
Check the fitting of high- and low-pressure hoses, relief valve and shaft seal.
Liquid tank
Check the 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 engine.

Set the heater A/C control as follows;

A/C switch: ON

Face mode

Intake position: Recirculation

Max cold temperature

Fan speed: High

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

10. Turn engine off and perform leak check again following steps 4 through 6 above.

REFRIGERANT LINES

ATC-149

ATC

Revision: 2004 November

2004 Murano

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 as 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