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dark colored coolant and no heat at idle
I just purchased a 06 f350 ps. 118000 miles. There is oil looking sludge around the filler neck of the coolant resevoir. The heater blows cool air at idle only. Today pressure seemed to be building up in the cooling system while idling. There appeared to be green coolant in the truck when I drained it yestereday to put the coolant flush in it. Also the coolant appears to be very dark in color after I refilled.
Based on my reading on this forum it could be a ruptured oil cooler or blown head gasket. I'm also seeing a lot of EGR cooler issues.
Is there anything else I should be looking for? What should be my next step here?
PS- I have worked on gasoline powered vehicles as a hobby for yrs, but have ZERO experience with diesels. Thanks for your help, in advance.