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Take off the plastic engine cover by unscrewing the engine oil fill neck and lifting it off. Disconnect the top radiator hose from the top of the engine. This frees up a vacuum caused when you remove the radiator drain plug. It's located on the lower driver side rear 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. Installing the drain plug, 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. Refilling the radiator leave the top hose off until you have all the coolant back into the radiator. Fill by removing the radiator cap on the passenger side top. Reconnect the top hose to the engine. Fill the overflow tank full of coolant. Run the engine up to operating temp. so the fan comes on. The overflow tank will empty into the system purging air. Refill the tank to the hot level mark. You're done.
Read more: Where_is_the_radiator_drain_plug_on_a_2005_Pontiac_Grand_Prix
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