Nissan Murano Z50 (2005 year). Manual - part 56

OVERHEATING CAUSE ANALYSIS

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OVERHEATING CAUSE ANALYSIS

PFP:00012

Troubleshooting Chart

ABS0035C

Symptom

Check items

Cooling sys-
tem parts 
malfunction

Poor heat transfer

Water pump malfunction

Worn or loose drive belt

—

Thermostat stuck closed

—

Damaged fins

Dust contamination or 
paper clogging

Physical damage

Clogged radiator cooling 
tube

Excess foreign material 
(rust, dirt, sand, etc.)

Reduced air flow

Cooling fan does not oper-
ate

Fan assembly

—

High resistance to fan rota-
tion

Damaged fan blades

Damaged radiator shroud

—

—

—

Improper engine coolant 
mixture ratio

—

—

—

Poor engine coolant quality

—

Engine coolant viscosity

—

Insufficient engine coolant

Engine coolant leaks

Cooling hose

Loose clamp

Cracked hose

Water pump

Poor sealing

Radiator cap

Loose

Poor sealing

Radiator

O-ring for damage, deterio-
ration or improper fitting

Cracked radiator tank

Cracked radiator core

Reservoir tank

Cracked reservoir tank

Overflowing reservoir tank

Exhaust gas leaks into 
cooling system

Cylinder head deterioration

Cylinder head gasket dete-
rioration

CO-6

OVERHEATING CAUSE ANALYSIS

Revision: 2005 August

2005 Murano

Except cool-
ing system 
parts mal-
function

—

Overload on engine

Abusive driving

High engine rpm under no 
load

Driving in low gear for 
extended time

Driving at extremely high 
speed

Powertrain system mal-
function

—

Installed improper size 
wheels and tires

Dragging brakes

Improper ignition timing

Blocked or restricted air 
flow

Blocked bumper

—

—

Blocked radiator grille

Installed car brassiere

Mud contamination or 
paper clogging

Blocked radiator

—

Blocked condenser

Blocked air flow

Installed large fog lamp

Symptom

Check items

COOLING SYSTEM

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COOLING SYSTEM

PFP:21020

Cooling Circuit

ABS0034X

PBIC2692E

CO-8

COOLING SYSTEM

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2005 Murano

System Chart

ABS00D9K

PBIC2693E

ENGINE COOLANT

CO-9

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ENGINE COOLANT

PFP:KQ100

Inspection

ABS0035F

LEVEL CHECK

●

Check if the reservoir tank engine coolant level is within the
“MIN” to “MAX” range when the engine is cool.

●

Adjust the coolant level as necessary.

LEAK CHECK

●

To check for leaks, apply pressure to the cooling system with the
radiator cap tester (commercial service tool) and the radiator
cap tester adapter [SST].

WARNING:

Do not remove radiator cap when the engine is hot. Serious
burns could occur from high pressure engine coolant
escaping from the radiator.

CAUTION:

Higher testing pressure than specified may cause radiator
damage.

NOTE:
In case that engine coolant decreases, replenish radiator with engine coolant.

●

If anything is found, repair or replace damaged parts.

Changing Engine Coolant

ABS0035V

WARNING:

●

To avoid being scalded, do not change engine coolant when the engine is hot.

●

Wrap a thick cloth around radiator cap and carefully remove radiator cap. First, turn radiator cap a
quarter of a turn to release built-up pressure. Then turn radiator cap all the way.

CAUTION:

Be careful not to allow engine coolant to contact drive belts.

DRAINING ENGINE COOLANT

1.

Remove radiator drain hole cap on undercover.

2.

Open radiator drain plug at the bottom of radiator,  and then
remove radiator cap. 

SMA412B

Testing pressure

: 157 kPa (1.6 kg/cm

2

 , 23 psi)

SLC756A

PBIC1204E

CO-10

ENGINE COOLANT

Revision: 2005 August

2005 Murano

When draining all of engine coolant in the system, open water drain plugs on cylinder block. Refer
to 

EM-114, "DISASSEMBLY"

 .

3.

Remove reservoir tank as necessary, and drain engine coolant and clean reservoir tank before installing.

4.

Check drained engine coolant for contaminants such as rust, corrosion or discoloration.
If contaminated, flush the engine cooling system. Refer to 

CO-11, "FLUSHING COOLING SYSTEM"

 .

REFILLING ENGINE COOLANT

NOTE:
When engine coolant is drained from radiator only, step 3, 4 and 6 are unnecessary.

1.

Install reservoir tank if removed, and radiator drain plug.

CAUTION:

Be sure to clean drain plug and install with new O-ring.

If water drain plug on cylinder block are removed, close and tighten them. Refer  to 

EM-119,

"ASSEMBLY"

 .

2.

Make sure that each hose clamp has been firmly tightened.

3.

Remove air duct assembly. Refer to 

EM-16, "AIR CLEANER AND AIR DUCT"

 .

4.

Disconnect heater hose (right side of vehicle) at the position in
the figure.

●

Enhance heater hose as high as possible.

5.

Fill radiator, and reservoir tank if removed, to specified level.

●

Pour engine coolant through engine coolant filler neck
slowly of less than 2   (2-1/8 US qt, 1-3/4 lmp qt) a minute
to allow air in system to escape.

●

Use Genuine Nissan Long Life Antifreeze/Coolant or
equivalent mixed with water (distilled or demineralized).
Refer to 

MA-10, "RECOMMENDED FLUIDS AND LUBRI-

CANTS"

 .

PBIC1205E

Radiator drain plug:

 

: 0.78 - 1.56 N·m (0.08 - 0.15 kg-m, 7 - 13 in-lb)

PBIC2847E

Engine coolant capacity
(With reservoir tank at “MAX” level)

: Approximately 9.6 

 (10-1/8 US qt, 8-1/2 lmp qt)

SMA182B

ENGINE COOLANT

CO-11

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●

When engine coolant overflows disconnected heater hose, connect heater hose, and continue filling the
engine coolant, if heater hose is disconnected.

6.

Install air duct assembly. Refer to 

EM-16, "AIR CLEANER AND AIR DUCT"

 .

7.

Install radiator cap.

8.

Warm up until opening thermostat. Standard for warming-up time is approximately 10 minutes at 3000
rpm.

●

Make sure thermostat opening condition by touching radiator hose (lower) to see a flow of warm water.

CAUTION:

Watch water temperature gauge so as not to overheat engine.

9.

Stop the engine and cool down to less than approximately 50

°

C (122

°

F).

●

Cool down using fan to reduce the time.

●

If necessary, refill radiator up to filler neck with engine coolant.

10. Refill reservoir tank to “MAX” level line with engine coolant.

11. Repeat steps 5 through 9 two or more times with radiator cap installed until engine coolant level no longer

drops. 

12. Check cooling system for leaks with engine running.

13. Warm up the engine, and check for sound of engine coolant flow while running engine from idle up to

3,000 rpm with heater temperature controller set at several position between “COOL” and “WARM”.

●

Sound may be noticeable at heater unit.

14. Repeat step 13 three times.
15. If sound is heard, bleed air from cooling system by repeating step 5 through 9 until engine coolant level no

longer drops.

FLUSHING COOLING SYSTEM

NOTE:
When engine coolant is drained from radiator only, step 2, 3 and 5 are unnecessary.
1.

Install reservoir tank if removed, and radiator drain plug.

If water drain plug on cylinder block are removed, close and tighten them. Refer  to 

EM-119,

"ASSEMBLY"

 .

2.

Remove air duct assembly. Refer to 

EM-16, "AIR CLEANER AND AIR DUCT"

 .

3.

Disconnect heater hose (right side of vehicle) at the position in
the figure.

●

Enhance heater hose as high as possible.

Reservoir tank engine coolant capacity
(At “MAX” level)

: 0.8   (7/8 US qt, 3/4 lmp qt)

SMA412B

Radiator drain plug:

 

: 0.78 - 1.56 N·m (0.08 - 0.15 kg-m, 7 - 13 in-lb)

PBIC2847E

CO-12

ENGINE COOLANT

Revision: 2005 August

2005 Murano

4.

Fill radiator and reservoir tank with water and install radiator cap.

●

When engine coolant overflows disconnected heater hose, connect heater hose, and continue filling the
engine coolant, if heater hose is disconnected.

5.

Install air duct assembly. Refer to 

EM-16, "AIR CLEANER AND AIR DUCT"

 .

6.

Run the engine and warm it up to normal operating temperature.

7.

Rev the engine two or three times under no-load.

8.

Stop the engine and wait until it cools down.

9.

Drain water from the system. Refer to 

CO-9, "DRAINING ENGINE COOLANT"

 .

10. Repeat steps 1 through 9 until clear water begins to drain from radiator.

RADIATOR

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RADIATOR

PFP:21400

Removal and Installation

ABS0035H

WARNING:

Do not remove radiator cap when engine is hot. Serious burns could occur from high-pressure engine
coolant escaping from radiator. Wrap a thick cloth around the cap. Slowly turn it a quarter of a turn to
release built-up pressure. Carefully remove radiator cap by turning it all the way.

REMOVAL

1.

Remove undercover.

2.

Drain engine coolant. Refer to 

CO-9, "Changing Engine Coolant"

 .

CAUTION:

●

Perform this step when the engine is cold.

●

Do not spill engine coolant on drive belts.

3.

Remove air duct (inlet) and radiator cover grills (right and left sides). Refer to 

EM-16, "AIR CLEANER

AND AIR DUCT"

 .

4.

Disconnect harness connector from fan motors, and move harness to aside.

5.

Disconnect CVT fluid cooler hoses.

●

Install plug to avoid leakage of CVT fluid.

6.

Remove radiator hoses (upper and lower) and reservoir tank hose.

1.

Bracket

2.

Reservoir tank cap

3.

Reservoir tank

4.

Bracket

5.

Clamp

6.

Reservoir tank hose

7.

Radiator upper clip

8.

Mounting rubber

9.

Radiator cap

10. Radiator

11.

Mounting rubber

12. Clamp

13. CVT fluid cooler hose

14. Clamp

15. Radiator hose (upper)

16. CVT fluid cooler hose

17. O-ring

18. Drain plug

19. Radiator hose (lower)

20. Radiator cooling fan assembly

PBIC1206E

CO-14

RADIATOR

Revision: 2005 August

2005 Murano

CAUTION:

Be careful not to allow engine coolant to contact drive belts.

7.

Remove reservoir tank and bracket.

8.

Remove battery and battery tray, and move fuse and fusible link block to aside. Refer to 

SC-4, "BAT-

TERY"

 .

9.

Remove radiator upper clips by pulling the tabs outside to
release the lock.
Do not pull the tabs outside excessively to prevent it from
damaging.

10. Remove mounting rubbers (upper) from mounting pins on radiator.

11. Lift up and remove radiator and radiator cooling fan assembly.

CAUTION:

Do not damage or scratch A/C condenser and radiator core when removing.

12. Remove radiator cooling fan assembly from radiator.

INSTALLATION

Note the following, and install in the reverse order of removal.

Radiator Upper Clip

Install radiator upper clip on radiator core connection as follows:

1.

Install mounting rubbers (upper) on mounting pins of radiator.

2.

Align radiator upper clip with radiator core connection, then insert radiator upper clip straight into radiator
core connections until a click is heard.

3.

After connecting radiator upper clip, use the following method to make sure it is fully connected.

●

Visually confirm that two radiator upper clips are connected to radiator core connections.

●

Move radiator upper clip and the radiator forward and backward to make sure they are securely con-
nected.

INSPECTION AFTER INSTALLATION

●

Check for leaks of engine coolant using the radiator cap tester adapter [SST: EG17650301 (J33984-A)]
and the radiator cap tester (commercial service tool). Refer to 

CO-9, "LEAK CHECK"

 .

●

Start and warm up the engine. Visually make sure that there is no leaks of engine coolant and CVT fluid.

PBIC1216E

PBIC1241E

RADIATOR

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Checking Radiator Cap

ABS007ZV

●

Check valve seat of radiator cap. 

–

Check if valve seat is swollen to the extent that the edge of the
plunger cannot be seen when watching it vertically from the top.

–

Check if valve seat has no soil and damage.

●

Pull negative-pressure valve to open it, and make sure that it
close completely when released.

–

Make sure that there is no dirt or damage on the valve seat of
radiator cap negative-pressure valve. 

–

Make sure that there are no unusualness in the opening and
closing conditions of negative-pressure valve.

●

Check radiator cap relief pressure.

–

When connecting radiator cap to the radiator cap tester adapter
[SST] and the radiator cap tester (commercial service tool),
apply engine coolant to the cap seal surface. 

●

Replace radiator cap if there is an unusualness related to the above three.

CAUTION:

When installing radiator cap, thoroughly wipe out the radiator filler neck to remove any waxy residue
or foreign material.

Checking Radiator

ABS007ZW

Check radiator for mud or clogging. If necessary, clean radiator as follows.

●

Be careful not to bend or damage radiator fins.

●

When radiator is cleaned without removal, remove all surrounding parts such as cooling fan, radiator
shroud and horns. Then tape harness and connectors to prevent water from entering.

1.

Apply water by hose to the back side of the radiator core vertically downward.

2.

Apply water again to all radiator core surfaces once per minute.

3.

Stop washing if any stains no longer flow out from radiator.

4.

Blow air into the back side of radiator core vertically downward.

●

Use compressed air lower than 490 kPa (5 kg/cm

2

 , 71 psi) and keep distance more than 30 cm (11.8

in). 

5.

Blow air again into all the radiator core surfaces once per minute until no water sprays out.

PBIC2816E

SMA967B

Standard:

78 - 98 kPa (0.8 - 1.0 kg/cm

2

 , 11 - 14 psi)

Limit:

59 kPa (0.6 kg/cm

2

 , 9 psi) 

SLC755A

CO-16

RADIATOR (ALUMINUM TYPE)

Revision: 2005 August

2005 Murano

RADIATOR (ALUMINUM TYPE)

PFP:21460

Disassembly and Assembly

ABS004RT

PREPARATION

1.

Attach spacer to tip of the radiator plate pliers A [SST].
Spacer specification: 18 mm (0.71 in) wide 

×

 8.5 mm (0.335 in)

long 

×

 1.5 mm (0.059 in) thick.

2.

Make sure that when the radiator plate pliers A [SST: KV99103510 (

—

)] are closed dimension H

′′

 is

approx. 7.6 mm (0.299 in).

3.

Adjust dimension H

′′

 with spacer, if necessary.

DISASSEMBLY

1.

Remove upper and lower tanks with the radiator plate pliers B
[SST].

CAUTION:

Do not disassemble lower tank and CVT fluid cooler.
NOTE:
Regard lower tank and CVT fluid cooler as an assembly.

1.

Upper tank

2.

Sealing rubber

3.

Core

4.

Lower tank (with CVT fluid cooler)

PBIC2539E

SLC655CB

SLC903-A

RADIATOR (ALUMINUM TYPE)

CO-17

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●

Grip the crimped edge and bend it upwards so that the radia-
tor plate pliers B slips off.

CAUTION:

Do not bend excessively.

●

In areas where the radiator plate pliers B cannot be used, use
a screwdriver to bend the edge up.

CAUTION:

Be careful not to damage tank.

2.

Remove sealing rubber.

3.

Make sure the edge stands straight up.

ASSEMBLY

1.

Clean contact portion of tank.

SLC893

SLC930

SLC931

SLC932

CO-18

RADIATOR (ALUMINUM TYPE)

Revision: 2005 August

2005 Murano

2.

Install new sealing rubber while pushing it with fingers.

CAUTION:

Be careful not to twist sealing rubber.

3.

Caulk tank in numerical order as shown in the figure with the
radiator plate pliers A [SST].

●

Use pliers in the locations where the radiator plate pliers A
cannot be used.

SLC917A

SLC904-A

PBIC2076E

SLC897

RADIATOR (ALUMINUM TYPE)

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4.

Make sure that the rim is completely crimped down.

5.

Make sure that there is no leakage.
Refer to 

CO-19, "INSPECTION"

 .

INSPECTION

1.

Apply pressure with the radiator cap tester adapter [SST] and
the radiator cap tester (commercial service tool).

WARNING:

To prevent the risk of hose coming undone while under
pressure, securely fasten it down with hose clamp.

CAUTION:

Attach hose to CVT fluid cooler to seal its inlet and outlet.

2.

Check for leakage by soaking radiator in water container with
the testing pressure applied.

Standard height “H”

: 8.0 - 8.4 mm (0.315 - 0.331 in)

SLC554A

Testing pressure

: 157 kPa (1.6 kg/cm

2

 , 23 psi)

SLC933-A

SLC934

CO-20

COOLING FAN

Revision: 2005 August

2005 Murano

COOLING FAN

PFP:21140

Removal and Installation

ABS00D9I

REMOVAL

1.

Drain engine coolant from radiator. Refer to 

CO-9, "Changing Engine Coolant"

 .

CAUTION:

●

Perform this step when the engine is cold.

●

Do not spill engine coolant on drive belts.

2.

Remove air duct (inlet) and radiator cover grills (right and left sides). Refer to 

EM-16, "AIR CLEANER

AND AIR DUCT"

 .

3.

Disconnect radiator hose (upper) at radiator side. Refer to 

CO-13, "RADIATOR"

 .

4.

Disconnect harness connector from fan motors, and move harness to aside.

5.

Remove battery and battery tray, and move fuse and fusible link block to aside. Refer to 

SC-4, "BAT-

TERY"

 .

6.

Remove mounting bolts to lift up and remove radiator cooling fan assembly.

CAUTION:

Be careful not to damage or scratch on radiator core.

INSTALLATION

Install in the reverse order of removal.

INSPECTION AFTER INSTALLATION

Make sure that fan motors operate normally.
NOTE:
Cooling fans are controlled by ECM. For details, refer to 

EC-463, "DTC P1217 ENGINE OVER TEMPERA-

TURE"

 .

1.

Cooling fan (RH)

2.

Cooling fan (LH)

3.

Fan shroud

4.

Fan motor

PBIC2694E