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The most likely cause of this is a blown head gasket dumping oil back into the coolant passages. The oil will mix with the glycol in the antifreeze and make a thick yellow paste. It is very important to flush the cooling system after the repair or this sludge will cause heating problems.

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Q: Why would the water in your radiator turn thick and yellow after overheating. This was both in the radiator and the overflow.?
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