What tool do you use to unscrew the radiator in a 2001 GMC if you want to flush the radiator?

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I believe ther is a petcock that can be opened with a 1/4" drive extension. You turn it about 1/3 of a turn and pull it out.

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First answer by Bclear. Last edit by Bclear. Contributor trust: 1394 [recommend contributor]. Question popularity: 72 [recommend question]

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