Question about 1999 GMC Suburban

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How do i flush the raditor on a 99 GMC Suburban

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I think you may have a hex head plug in the bottom of the radiator, although they do not now offer this option for draining... If so, get a long 1/2 or 3/8 extension with a 14 or 15 metric socket and loosen it after removing the fill cap. Make sure it has cooled down... else, you will have to loosen the lower water line from the radiator to drain... you should do this again wiht water into to get the best results... remember the water will not enter the block fully until the thermostat is open ie you must refill and check several times when refilling... put you new antifreeze in first then finish with water.. or you may mix small amounts ie, 1/2 gall at a time to get a 50/50 mix. good luck

Posted on Dec 30, 2008

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