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yes. The plug you found under your car on the passenger side is the drain plug. Unscrew it off and drain using water hose. Refill with GM APPROVED anti-freeze (50% water and 50% anti-freeze). MAKE SURE you look in the owners manual. It will tell you what kind of anti-freeze to use or just go to Autozone and look for the GM APPROVED stamp on a anti-freeze bottle. The one I use is Preston and it came in a gray bottle. I just filled it up until it was full.
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