6.0L Losing coolant... Again.
Ive got a 2006 Ford F-250 King Ranch 4x4 with the infamous 6.0L. Shes got 210,000 miles on her and runs great. Ive had the EGR cooler replaced along with the oil cooler and some other odds and ends along the way. Headgasket has never blown (Hopefully thats still the case). The EGR cooler and oil cooler were replaced at approximatly 170-180,000 miles. I have recently started losing coolant again. No white smoke. I have pulled the EGR valve, there is carbon on the valve, but not gooey carbon as is typical with leaking EGR cooler. When looking in where the valve is removed from there appears to be a good bit of built up carbon, not gooey or wet, almost looks like a small pile. My question is this, does anyone have any ideas as to what may be wrong, and or other tests i can conduct without taking it to a shop to diagnose the problem?
Thanks in advance!