I have a new 2021 Powerboost with 3K miles. Just completed my first RV tow, spread out over two days. Once each day I got a warning that the coolant was overheated. First day, ran for a hundred miles and stopped for a break/lunch. Turned on the AC. Ran for another hundred or so (almost 2 hours)...
From day 1 on my new F150 Hybrid, I've had the error message (photo attached). I was out of town for most to the first month after buying the truck, so wasn't too worried about it. I assumed I'd figure it out as I learned about the tech on the truck. Well, finally had the time to dive in...