WARNING: This page is about a different car, the 2008 Suzuki Grand Vitara, 2007 Suzuki Grand Vitara, and 2006 Suzuki Grand Vitara. However, it is still accessible from the selected car via links, so may be relevant.
Remove radiator cap.
Drain coolant from radiator drain plug (1).
After draining coolant, be sure to tighten drain plug (1) securely.