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If your truck also has leaking EGR cooler(s) on it, this can cause positive results on the dye test.
Measure the cooling system pressure when you're honking on the truck - if it rises to or exceeds 16psi you will need to pressure test the EGR coolers first, then evaluate the head gaskets.
What are the symptoms you are experiencing to get you to the point where you got the cooling system checked for combustion gas?
Ford Senior Diesel Technician
2008 F-350 4x4 Off Road 6.4 Powerstroke Diesel
There are strange things done 'neath the midnight sun by the men who moil for gold.
The arctic trails have their secret tales that would make your blood run cold.