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itits a redish black film
no codes just comes out of overflow
what other signs would u have
car gets almost to the res zone but car does not back up through the over spill line on cooland recovery tank this is a northstar 4.6
radiator replaced 20,000 miles ago, pressure tests at 15 lbs, holds, upper hose hot, lower hose hot ,inter&outer hoses hot, radiator fans work, good lord help a old man out please!!!!!
hose no coolant flow,also tiny litte shiny objects in coolant,help