soot in coolant

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    New here. Soot in coolant tank

    Hello I'm new to the ecodiesle community. Today I noticed that there is what looks like black soot on the walls of the coolant tank. Anyone have any ideas of what is the cause? I have a 2015 Laramie with 62,000 miles on it . Bought it used from the dealer black Friday weekend 2018. I hear it...