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It could be either the head gasket or the water pump is sucking a little air. Most likely the head gasket though. There are chemical tests to determine if carbon monoxide is getting into the coolant. If it IS, you have a bad headgasket/warped head.

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โˆ™ 2011-09-13 23:43:44
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Q: Why does a car engine repeatedly need to bleed excess air from water or radiator?
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