I also have a 04 F250 with the 6.0 diesel
I have read the anti freeze in that year truck should only be filled up to the min mark on the coolant mark, not to the max.
It was a Ford mess up. I have heard of that happening to people on stock settings too.
For more info on your truck, I suggest www ...

i have a 04 6 litre. i purchased the preadator, 4inch exhaust and new intake. one day i got on my truck pretty hard and when i pulled over about five minutes later i had alot of anti-freeze on the inside of the drivers fender. i took it to a mechanic ad he stated i have a blown head gasket. i took ...