I've taken my truck to the Ford dealer 3 times for the same issue, coolant puking out the degas bottle. The first time, they replaced the bottle cap and said it was a bad cap. The second time they pressure tested it and said everything was fine, third time they replaced the backpressure sensor and said everything was good to go. Well I got my truck back and my bottle is completely dry with coolant all over my engine compartment again, I smell the coolant when I tow, or WOT, or simply climbing hills, coming through my AC vents. What is wrong? Why would they not replace an EGR cooler or figure out the problem after 3 tries? There doesn't seem to be any coolant in oil, no white smoke out exhaust, and the engine doesn't seem to be running hot.