1.Install reservoir tank if removed.

2.Install radiator drain plug.
■ CAUTION ■
Be sure to clean drain plug and install with new O-ring.

Tightening torque | : Refer to Exploded View (GT-R certified NISSAN dealer).

If water drain plugs on cylinder block are removed, close and tighten them. Refer to Disassembly and Assembly (GT-R certified NISSAN dealer).

3.Check that each hose clamp has been firmly tightened.

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.
- Use Genuine NISSAN Long Life Antifreeze/Coolant or equivalent mixed with water (distilled or demineralized). Refer to Fluids and Lubricants.

  Engine coolant capacity | : Refer to Periodical Maintenance Specification.
  (With reservoir tank at “MAX” level)

5.Install radiator cap.

6.Fill reservoir tank to “MAX” level line with engine coolant if necessary.

A | : MAX
B | : MIN

Reservoir tank engine coolant capacity | : Refer to Periodical Maintenance Specification.
(At “MAX” level)

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 reservoir 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 Inspection.