Infiniti M35/M45 Y50. Manual - part 350

ENGINE COOLANT

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CAUTION:

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

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

EM-257,

"ASSEMBLY"

 .

2.

Make sure that each hose clamp has been firmly tightened.

3.

Remove air relief plug (1) on heater hose.

4.

Fill thermostat housing and reservoir tank to specified level.

●

Refill engine coolant up to filler neck of thermostat housing.

●

Pour engine coolant through engine coolant filler neck slowly of less than 2   (2-1/8 US qt, 1-3/4
Imp 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-12, "RECOMMENDED FLUIDS AND LUBRICANTS"

 .

●

When engine coolant overflows air relief hole on heater hose,
install air relief plug.

5.

Install radiator cap.

6.

Warm up until opening thermostat. Standard for warming-up time is approximately 10 minutes at 3,000
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.

7.

Stop engine and cool down to less than approximately 50

°

C (122

°

F).

●

Cool down using a fan to reduce the time.

●

If necessary, refill engine coolant up to filler neck of thermostat housing.

8.

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

9.

Repeat steps 4 through 7 two or more times with radiator cap installed until engine coolant level no longer
drops.

10. Check cooling system for leaks with engine running.

Radiator drain plug:

 : 1.2 N·m (0.12 kg-m, 11 in-lb)

: Engine front

PBIC3394E

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

Approx. 10.4   (11 US qt, 9-1/8 Imp qt)

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

0.8   (7/8 US qt, 3/4 lmp qt)

Air relief plug:

 : 1.2 N·m (0.12 kg-m, 11 in-lb)

SMA412B

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ENGINE COOLANT

11. Warm up 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.

12. Repeat step 11 three times.
13. If sound is heard, bleed air from cooling system by repeating steps 4 through 7 until engine coolant level

no longer drops.   

FLUSHING COOLING SYSTEM

1.

Install reservoir tank, and radiator drain plug.

CAUTION:

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

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

EM-257,

"ASSEMBLY"

 .

2.

Remove air relief plug (1) on heater hose.

3.

Fill thermostat housing with water until water spills from the air relief hole, then close air relief plug. Fill
thermostat housing and reservoir tank with water and reinstall radiator cap. 

4.

Run engine and warm it up to normal operating temperature.

5.

Rev engine two or three times under no-load.

6.

Stop engine and wait until it cools down.

7.

Drain water from the system. Refer to 

CO-40, "DRAINING ENGINE COOLANT"

 .

8.

Repeat steps 1 through 7 until clear water begins to drain from radiator.

Radiator drain plug:

 : 1.2 N·m (0.12 kg-m, 11 in-lb)

: Engine front

PBIC3394E

Air relief plug:

 : 1.2 N·m (0.12 kg-m, 11 in-lb)

RADIATOR

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RADIATOR

PFP:21400

Components

NBS004RG

●

Refer to 

GI-11, "Components"

  for symbols in the figure.

Removal and Installation

NBS004RH

WARNING:

Do not remove radiator cap when engine is hot. Serious burns could occur from high-pressure engine
coolant escaping from thermostat housing. Wrap a thick cloth around radiator 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 the following parts:

●

Front engine undercover (power tool). 

●

Engine room cover (RH and LH). Refer to 

EM-173, "ENGINE ROOM COVER"

 .

●

Air duct (inlet) and air cleaner case assembly. Refer to 

EM-177, "AIR CLEANER AND AIR DUCT"

 .

2.

Remove front grille and front grille support. Refer to 

EI-16, "FRONT GRILLE"

 . 

3.

Drain engine coolant from radiator. Refer to 

CO-40, "ENGINE COOLANT"

 .

1.

Reservoir tank cap

2.

Reservoir tank

3.

Reservoir tank bracket

4.

Reservoir tank hose

5.

Radiator hose (upper)

6.

Air guide

7.

Mount bracket (RH)

8.

Mounting rubber (upper)

9.

A/C condenser

10. Mount bracket (LH)

11.

Radiator

12. Mounting rubber (lower)

13. A/T fluid cooler hose

14. A/T fluid cooler hose

15. O-ring

16. Drain plug

17. Radiator hose (lower)

18. Cooling fan assembly

A.

To thermostat housing

B.

To water suction pipe

C.

To transmission

PBIC4718E

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RADIATOR

CAUTION:

●

Perform this step when the engine is cold.

●

Do not spill engine coolant on drive belts.

4.

Remove the A/C piping bracket from left side member, and then move the A/C piping out of the way.

5.

Disconnect A/T fluid cooler hoses from radiator.

●

Install blind plug to avoid leakage of A/T fluid.

6.

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

CAUTION:

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

7.

Remove cooling fan assembly (1). Refer to 

CO-51, "COOLING

FAN"

 .

CAUTION:

Do not damage or scratch radiator core when removing.

8.

Remove radiator as follows:

a.

Remove mount bracket (RH and LH).

b.

Pull the radiator (1) rearward from the vehicle, and then remove
the mounting bolts (3) and A/C condenser (2).

NOTE:
Figure shows right side.

c.

Lift up and pull the radiator (4) rearward, and then remove the
mounting rubber (lower) (3) from the radiator core support (2).

CAUTION:

At this time, A/C condenser is on the lower end of radiator
front surface. Minimize the movement to the rear side.

d.

Lift up the A/C condenser to disengage the lower end of front surface, and then remove the radiator.

CAUTION:

●

Be careful not to damage radiator and A/C condenser core.

●

Minimize the lift of A/C condenser to prevent load from being applied to A/C piping.

e.

After removing the radiator, place the A/C condenser on the radiator core support to prevent load from
being applied to piping. And then, temporarily secure them using a rope to prevent them from being
dropped.

INSTALLATION

Installation is the reverse order of removal.

KBIA3587J

KBIA3586J

1

: A/C condenser

: Engine front

PBIC3389E