So I just got my f350 DRW out of the shop Thursday where it had the complete fuel system including injectors replaced (thank god for warranty). I hooked up my 8,000 pound trailer and headed for the coast. The outside temp stayed around 90 degrees most of the trip. The auxiliary fan ran pretty much the whole way down. It would go off for only a few seconds and then come right back on. The fuel mileage was horrible. I got 260 miles to the tank and the computer gave an average of 7.8.
I am going to try and run to a local dealership this morning to see if it's a quick fix. Any ideas on why the fan is running that often?