Ive got a 2014 ecoboost 1.0 with 101670 miles. Bought it new in march of 2014.
So last week I'm making my 4 hr commute to work and 60 miles in I get a alert that the car is overheating. I immediately shut it down and brought it home on my trailer. I picked up a water pump and the upper thermostat housing assembly during the week and changed both on Saturday. Refilled the system, went through the purging procedure. The car ran perfect and no sign of leakage. I let it idle in the drive for an hour, no issues. So I drove it to town and back, about 60 miles and just as I got home it did the same thing. Coolant was low. No visible leaks. Any Ideas where the leak is. No abnormal pressure in the cooling system, no water in the oil or oil in the coolant. It did have a little bit of oil in the down stream side of the turbo mostly collected at the bottom inner cooler connection. I ordered the factory service manual from Ford to the tune of 250$ but it hasn't come in yet. Ive always changed the oil early and used Mobil one since it was new. Its always been flawlessly dependable.
Any helpful information would be appreciated. I don't want to order a new head unless that's for sure whats failed.