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Spews coolant (sometimes)
After much reading, I'm not sure if my truck is unusual or just unlucky. I have a 2008 Job 1 Super Duty, that has now all of a sudden decided while pulling any sort of grade that it wants to spew coolant everywhere. It doesn't leak coolant when parked, doesn't run hot and doesn't leak riding around town. The truck has 25,000 miles and does towing, DD duty.
To preface this: it has an SCT tuner with a DOC/DPF delete left on transmission only when towing. I don't drag race the thing or anything, I did the delete because the mileage sucked. The truck has never run hot, nor ran hot when it leaked coolant. It has the venturi-t installed and to this point hasn't had any significant problem.
So after the first incident (where I lost about 2 gallons of coolant) I took the truck back to Ford, where they replaced the upper hose. I'm thinking everything is fine, so I tow an empty trailer to Reno and back - no leak for the trip there and most of the trip back. The coolant is concentrated on the leaf front frame rail area and near the middle-top of the radiator (along with the whole side of the truck from this occurring at highway speed).
I get back to the Bay and the damned thing has leaked coolant. So I took it in, and the dealer said it's a degassing cap, which they replaced. I had trouble believing this was the problem.
I've since returned everything to stock at the recommendation of the service advisers (who are pretty cool come to think of it) to go in and make Ford fix this thing. It doesn't act like a blown head gasket or anything, but again I'm not taking any chances in the Ford-Navistar pissing match that is going on.
I've read all the Job 1 radiator threads, so I'm thinking this could be the problem, but I wanted to confirm that others were having similar intermittent leaks.
Thanks for your input!