Yeah internal water pump, everything I’ve read is that when it goes the engine is usually toast.

take it back to the dealer and insist on a vacuum flush/refill on the radiator, you may have an air gap in the block that won't move.

they will put a vacuum on it to pull the old anti freeze out and then put the new back in, the vacuum sucks it into everywhere and they can also tell if you have a leak in the cooling system while doing it.

I would start there.

are the turbos spooling up right? when you pull a trailer are you mashing the gas to get going and spooling them up? might check the blow off valves and make sure they are not sticking, if they stick you have turbo 100% of the time and lower rpms that could cause your problem.

jmo

and I have a 14 f150 xlt coyote that has been the best truck I have ever owned.

Where does everyone have their front license plate mounted

Thanks hopalong

??? Ecoboost water pumps are external.......the water pump on my Tundra was internal and a PITA but it really didn't matter since the timing belt had to be changed every 100,000 miles anyway

I thought the Tundra 5.7 had timing chains not belts. My 5.7 has almost 200,000 on it and never touched the chains.

Correct on the 5.7....I had the small V8 4.7. Never had problems with it, just needed to do the belt and water pump around 100,000 miles. Sold at 270, 000 with original power train running good....