I just changed my coolant (drain, flush, refill) in five steps as show below:
- With engine off and cool, remove radiator cap.* Drain radiator then close draincock.
- Pour entire contents of Prestone® Super Radiator Flush into radiator and fill with water. For systems larger that 12 quarts, use two bottles.
- Run engine with heater on highest temperature setting for 10 minutes after reaching normal operating temperature.
- With engine off and cool, remove radiator cap, drain radiator, and close draincock. Refill with water and replace radiator cap to fully closed position. Repeat step #3.
- Stop engine and allow to cool. Remove radiator cap, drain system and close draincock. Add enough recommended coolant to achieve a 50-70% concentration. Top off radiator with water. Replace radiator cap to fully closed position. Run engine for 20 minutes to mix coolant/water.
I poured only ''one'' gallon of fluid (used destilled water) in each step, my radiator won't take more! is that a bad sign?
I had to refill the coolant reservoir once (after finished the job and let engine cool down for an hour) it's ok now...
By the way, the engine runs smoother than ever!!!