cooling not so cool

mopar505 said

2. fluid looks cruddy, guessing from the dyno pulls it got some junk stirred up. brown rust color. was green before tune.

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ok, i have to ask. if this is a new build, WHY is there "junk" in the coolant if this is a fresh build? old radiator? did anyone remove all the freeze plugs and clean the coolant passages? old heater core? :realcrazy: