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drain all coolant from system. flush with water until clean water is comming out of engine. fill rad with water and run engine up to temp. this should help remove the antifreeze from the engine. drain water out and run water through system again until clean. add new coolant to system. should be good. use garden hose to flush out system

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Q: What is the best way to flush coolant on a 1998 GM 4.3 pickup?
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