1.Install reservoir tank if removed, and 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).

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 Draining.

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