Infiniti Q45. Manual - part 279

ENGINE COOLANT

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

EM-88,

"ASSEMBLY"

 .

2.

Remove air relief plug on heater hose.

3.

Fill radiator and reservoir tank to specified level.

●

Use Genuine Nissan Long life Antifreeze/Coolant or equivalent 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.

Install radiator cap.

5.

Warm up until opening thermostat and water control valve. 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.

6.

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 radiator up to filler neck with engine coolant.

Radiator drain plug:

 : 1.17 N·m (0.12 kg-m, 10 in-lb)

PBIC0954E

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

  Approx. 10.3  (10-7/8 US qt, 9-1/8 Imp qt)

SMA182B

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

  0.8  (7/8 US qt, 3/4 lmp qt)

SMA412B

CO-10

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.   

FLUSHING COOLING SYSTEM

1.

Install reservoir tank if removed, and radiator drain plug.

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

EM-88,

"ASSEMBLY"

 .

2.

Remove air relief plug on heater hose.

3.

Fill radiator with engine coolant until engine coolant spills from the air relief hole, then close air relief plug.
Fill radiator and reservoir tank with engine coolant 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 engine coolant from the system. Refer to 

CO-8, "DRAINING ENGINE COOLANT"

 .

8.

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

Radiator drain plug

: 1.17 N·m (0.12 kg-m, 10 in-lb)

PBIC0954E

RADIATOR

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RADIATOR

PFP:21400

Removal and Installation

NBS001PP

WARNING:

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

REMOVAL

1.

Drain engine coolant from radiator. Refer to 

CO-8, "Changing Engine Coolant"

 .

CAUTION:

●

Perform when engine is cold.

●

Do not spill engine coolant on drive belts.

2.

Remove cooling fan assembly. Refer to 

CO-18, "Removal and Installation"

 .

3.

Remove A/T fluid cooler hoses. 

●

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

4.

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

1.

Radiator hose (upper)

2.

Radiator mounting bracket

3.

Mounting rubber

4.

Clip

5.

Radiator

6.

O-ring

7.

Radiator drain plug

8.

Mounting rubber

9.

A/T fluid cooler hose

10. Radiator hose (lower)

11.

Cooling fan assembly

12.

Reservoir tank hose

13. Reservoir tank

14.

Reservoir tank cap

15.

Reservoir tank bracket

PBIC2776E

CO-12

RADIATOR

5.

Lift A/C condenser up approximately 2 cm (0.79 in). 
Remove clips from right and left flange parts of A/C condenser. 

CAUTION:

To avoid putting a load on A/C piping, be careful not to lift
too much.

6.

Lift up and remove radiator.

CAUTION:

●

Do not damage or scratch radiator core when removing.

●

After removing radiator, fix A/C condenser on the vehicle
side with a rope or similar means. This is to prevent a
load being applied to A/C piping.

INSTALLATION

●

Install in the reverse order of removal.

CHECKING RADIATOR CAP

●

Valve seat of radiator cap inspection. 

–

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 in negative–pressure valve, or if the relief pressure fall
below the limit.

CAUTION:

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

PBIC2673E

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