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It's located on the lower driver side very corner of the radiator. It's a plastic nut with a couple tabs sticking out. Use a 19mm deep socket and short extension to unscrew it. The plug will come all the way out with a pull. It has a rubber seal on it so there will be a bit of resistance. Put it back just snug. You don't want to strip it. The rubber seal does the job, so it doesn't have to be real tight.

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11y ago
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Q: Where is the radiator drain plug on a 2005 Pontiac Grand Prix?
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