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Well in theory when motor not running , no pressure exhaust side so coolant could seep in.

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The one I've seen Mark was at jpc and EGR cooler had a crack in it and was pouring coolant in it.
I personally seen it. Hairline crack.

Rare , but it does happen .

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I hope the second opinion is right .
I have seen one EGR cooler crack and leak coolant into it. So... There is hope.


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