Infiniti M45 (Y34). Manual - part 284

ENGINE COOLANT

CO-9

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ENGINE COOLANT

PFP:KQ100

Inspection

ABS004R4

LEVEL CHECK

●

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

●

Adjust engine coolant if too much or too little.

CHECKING COOLING SYSTEM FOR LEAKS

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

WARNING:

Never remove radiator cap when engine is hot. Serious burns
could occur from high pressure engine coolant escaping from
radiator.

CAUTION:

Higher pressure than specified may cause radiator damage.
NOTE:
In a case that engine coolant decreases, replenish radiator with engine coolant.

●

If anything is found, repair or replace damaged parts.

Changing Engine Coolant

ABS004R5

WARNING:

●

To avoid being scalded, never change engine coolant when engine is hot.

●

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

DRAINING ENGINE COOLANT

1.

Remove engine undercover with power tool.

2.

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

●

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

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

EM-81, "DISASSEMBLY"

 .

3.

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"

 .

4.

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

REFILLING ENGINE COOLANT

1.

Install reservoir tank if removed, and radiator drain plug.

CAUTION:

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

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

EM-85, "ASSEM-

BLY"

 .

SMA412B

Testing pressure : 157 kPa (1.6 kg/cm

2

 , 23 psi)

PBIC0953E

Radiator drain plug:

 : 0.78 - 1.56 N·m (0.08 - 0.16 kg-m, 7 - 14 in-lb)

CO-10

ENGINE COOLANT

2.

Remove air relief plug on heater hose.

3.

Fill radiator and reservoir tank to specified level.

●

Use genuine Nissan anti-freeze engine coolant or equiva-
lent mixed with water (distilled or demineralized). Refer to

MA-10, "RECOMMENDED FLUIDS AND LUBRICANTS"

 .

●

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.

●

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

4.

Warm up engine to normal operating temperature with radiator
cap installed.

5.

Run engine at 3,000 rpm for 10 seconds and return to idle speed.

●

Repeat two or three times.

CAUTION:

Watch engine coolant temperature gauge so as not to overheat the engine.

6.

Stop engine and cool down to less than approximately 50

°

C (122

°

F).

●

Cool down using a fan to reduce the time.

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

7.

Refill reservoir tank to MAX level line with engine coolant.

8.

Repeat steps 3 through 6 two or more times with radiator cap installed until the engine coolant level no
longer drops.

9.

Check cooling system for leaks with engine running.

10. 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.

11. Repeat step 10 three times.

12. If sound is heard, bleed air from cooling system by repeating steps 3 through 6 until engine coolant level

no longer drops.   

●

Clean excess engine coolant from engine.

PBIC0954E

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

  Approximately 9.8  (10-3/8 US qt, 8-5/8 Imp qt)

SMA182B

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

  0.8  (7/8 US qt, 3/4 lmp qt)

SMA412B

ENGINE COOLANT

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FLUSHING COOLING SYSTEM

1.

Install reservoir tank, and radiator drain plug.

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

EM-85, "ASSEM-

BLY"

 .

2.

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. 

3.

Run engine and warm it up to normal operating temperature.

4.

Rev engine two or three times under no-load.

5.

Stop engine and wait until it cools down.

6.

Drain water from the system. Refer to 

CO-9, "DRAINING ENGINE COOLANT"

 .

7.

Repeat steps 2 through 6 until clear water begins to drain from radiator.

Radiator drain plug:

 : 0.78 - 1.56 N·m (0.08 - 0.16 kg-m, 7 - 14 in-lb)

CO-12

RADIATOR

RADIATOR

PFP:21400

Removal and Installation

ABS004R6

WARNING:

Never remove radiator cap when engine is hot. Serious burns could occur from high pressure engine
coolant escaping from radiator.

REMOVAL

1.

Drain engine coolant from radiator. Refer to 

CO-9, "Changing Engine Coolant"

 .

CAUTION:

●

Perform when the engine is cold.

●

Do not spill engine coolant on drive belts.

2.

Remove cooling fan shroud. Refer to 

CO-19, "Removal and Installation"

 .

3.

Remove A/T oil cooler hoses. 

●

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

4.

Remove bolts of both right and left end of radiator core (2 bolts for each).

1.

Radiator

2.

Bracket

3.

Mounting rubber

4.

Clip

5.

Mounting rubber

6.

O-ring

7.

Radiator coolant temperature sensor

8.

Radiator hose (lower)

9.

Reservoir tank hose

10. Clip

11.

Bracket

12.

Bracket

13. Clip

14.

Reservoir tank

15.

Cap

16. A/T oil cooler hose

17.

Drain plug

18.

Cooling fan shroud

19. O-ring

20.

Radiator hose (upper)

21.

Bracket

PBIC2281E