Nissan GT-R. Manual - part 66

ENGINE COOLANT

CO-5

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• To check for leakage, apply pressure to the cooling system with the

radiator cap tester (commercial service tool) (A) and radiator cap
tester adapter (commercial service tool) (B).

WARNING:

Never remove radiator cap and reservoir tank cap when
engine is hot. Serious burns could occur from high-pressure
engine coolant escaping from engine cooling system.

CAUTION:

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

• If anything is found, repair or replace damaged parts.

Draining

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WARNING:

• Never change engine coolant when the engine is hot to avoid being scalded.
• Wrap a thick cloth around reservoir tank cap and carefully remove reservoir tank cap. First, turn res-

ervoir tank cap a quarter of a turn to release built-up pressure. Then turn reservoir tank cap all the
way.

1.

Remove engine undercover. Refer to 

EXT-35, "ENGINE UNDER COVER : Exploded View"

.

2.

Open radiator drain plug (1) at the bottom of radiator, and then
remove reservoir tank cap. 

3.

Remove reservoir tank if necessary, 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-6, "Flushing"

.

Refilling

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CAUTION:

• Do not reuse O-rings.
• Do not put additive such as waterleak preventive, since it may cause cooling waterway clogging.
• When refilling use Genuine NISSAN Long Life Antifreeze/Coolant (blue) or equivalent in its quality

mixed with water (distilled or demineralized). Refer to 

MA-22, "Fluids and Lubricants"

.

1.

Install reservoir tank if removed.

2.

Install radiator drain plug.

CAUTION:

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

3.

Check that each hose clamp has been firmly tightened.

Testing pressure

: Refer to 

CO-10, "Radiator"

.

PBIC5121J

: Vehicle front

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Tightening torque

: 1.2 N·m (0.12 kg-m, 11 in-lb)

CO-6

< PERIODIC MAINTENANCE >

ENGINE COOLANT

4.

Fill radiator 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.

5.

Install radiator cap.

6.

Fill reservoir tank to “MAX” level line with engine coolant if nec-
essary.

7.

Install reservoir tank cap, and then start the engine.

8.

Warm up engine until thermostat opens. Standard for warming-up time is approximately 10 minutes at
3,000 rpm.
• Check 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. Repeat steps 6 through 9 two or more times with radiator cap and reservoir tank cap installed until engine

coolant level no longer drops. 

11. When the coolant level of the radiator stops lowering, refill reser-

voir tank to the midpoint between the “MIN” (B) and “MAX” (A) of
the reservoir tank.

12. Check cooling system for leakage 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 positions 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 steps from 3 to 13 until engine coolant level

no longer drops. 

16. Recheck reservoir tank engine coolant level with the engine completely cold. Refer to 

CO-4, "Inspection"

.

Flushing

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1.

Install reservoir tank if removed, and radiator drain plug.

Engine coolant capacity

: Refer to 

CO-10, 

"Periodical Maintenanc
e Specification"

.

(With reservoir tank at 
“MAX” level)

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A

:  MAX

B

:  MIN

Reservoir tank engine cool-
ant capacity

: Refer to 

CO-10, 

"Periodical Maintenanc
e Specification"

.

(At “MAX” level)

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ENGINE COOLANT

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CAUTION:

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

2.

Fill radiator and reservoir tank with water.

3.

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

4.

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

5.

Stop the engine and wait until it cools down.

6.

Drain water from the system. Refer to 

CO-5, "Draining"

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7.

Repeat steps 1 through 6 until clear water begins to drain from radiator.

Tightening torque

: 1.2 N·m (0.12 kg-m, 11 in-lb)

CO-8

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RADIATOR

RADIATOR

RESERVOIR TANK CAP

RESERVOIR TANK CAP : Inspection

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• Check valve seat of reservoir tank cap. 
- Check if valve seat (A) is swollen to the extent that the edge of the

metal plunger (B) 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 check that it close

completely when released.

- Check that there is no dirt or damage on the valve seat of reservoir

tank cap negative-pressure valve. 

- Check that there are no unusualness in the opening and closing

conditions of negative-pressure valve.

• Check reservoir tank cap relief pressure.
- When connecting reservoir tank cap to the radiator cap tester

(commercial service tool) and the radiator cap tester adapter (com-
mercial service tool) (A), apply engine coolant to the cap seal sur-
face. 

• Replace reservoir tank cap if there is an unusualness related to the above three.

CAUTION:

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

RADIATOR

RADIATOR : Inspection

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Check radiator for mud or clogging. If necessary, clean radiator as follows:
• Be careful not to bend or damage radiator fins.
• 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.

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SMA967B

Standard and limit

: Refer to 

CO-10, "Radiator"

.

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