Prestone Command Flush and Degreaser

Drain: Drain the old coolant from the system. Add Cleaner: Add the Prestone HD 2-in-1 Flush & Degreaser and fill with water. Circulate: Run the engine to operating temperature for 45-60 minutes (longer for very dirty systems). Flush: Thoroughly flush the system with water until clear. Refill: Add new Prestone HD antifreeze/coolant and top off with water to achieve the correct mixture, then drive to mix.