It's unanimous. Without even looking at the car, we all agree it's probably the water pump. Happened to me last spring on a Saturday morning in Flesherton, Ontario. Car stayed at Boyd Bros. Ford (very small dealership) until Monday for the T-stat. Found that the T-stat wasn't the problem, it was the WP. Finally got the car back on the Wednesday. Broke again next week. Turns out they installed a rebuilt water pump.
I borrowed the 'rents car for the week.
In all, I had 3 more NEW Ford pumps installed over last spring/summer (4 replacements in all). I bought more Prestone than any individual in Ontario last year.
Bottom line: If it isn't under warranty, get an aftermarket water pump.
Craig