QX4 2WD V6-3.5L (VQ35DE) (2003)
Coolant: Service and Repair
Flushing Cooling System
FLUSHING COOLING SYSTEM
1. Open air relief plug.
2. Fill radiator with water until water spills from the air relief holes, then close air relief plugs. Fill radiator 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.
7. Repeat steps 1 through 6 until clear water begins to drain from radiator.