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first suggestion would be the head gasket which Montana's are notorious for having problems with, followed closely by a crack in your cylinder head or engine block

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Q: What would cause water in oil on a 2001 Pontiac Montana?
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Why would your 2000 Pontiac Montana be smoking and dripping water out the tailpipe after replaceing the thermostat and temp sensor?

small amounts of water coming from the muffler is normal but if its antifreeze its not


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