mabynack wrote:
It can be a sign of a leaking head gasket. You might start to notice a white smoke when you're under full throttle. That's coolant steam going out the exhaust. It can be caused by a leaking head gasket or by a hole in the EGR cooler. Both are bad news. A good garage can check for both. They can put a coolant pressure checker on the coolant reservoir and see if it holds pressure. If not, they can run a compression check and look for a leaky head gasket.
I'm with mabynack. I'd take it to Ford and have it checked, that way you have a record established with Ford should the problem come back at a later date.
My 8.1 gas engine will get up 238 degrees sometimes and it doesn't loose any coolant, nor should yours.
I use an UltraGauge to keep track of everything. $70.
Track your temperature.