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Truck overheats at high speeds water pump does not leak i replaced every possible part there is

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Have you tried checking the fan clutch. make sure that it is locking up when warm. when engine is warm, turn off engine and watch the fan. it should stop immediately. if it keeps spinning, fan cluth is bad. also feel inside of radiator all around for hot and warm to cool spots. radiator may need rod out...good luck

Posted on Jan 06, 2009

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