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Believe it or not, there is not a radiator drain plug on the 2004 GMC Savana 2500. I had to change the coolant the old fashion way by taking off the bottom hose and letting it drain. Check the hose to make sure it's serviceable before putting it back on. Push the hose all the way up on the water pump inlet and place the clamp about 1/4" - 1/2" form the top of the hose.
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