[jwasbury]

Bought this truck new in late 2013, was one of the first new 2014 models at the dealer.

Driving home tonight towards the end of my 80 mile commute, I'm climbing a short but pretty steep hill on a country road that you enter on a sharp curve so you are accelerating pretty hard up the grade from a low speed. About at the top of the hill, the truck throws a warning message in the DIC that reads: "Overheat Warning Idle Engine."

Never seen this before...look at temp gauge and its pegged at 260...top of the range. Oh crap. Already out of the throttle at this point as the grade has leveled off, I am looking for a safe place to pull over and have my eye on that temp gauge. Within seconds, the temp gauge moves rapidly back to the normal operating point (210) and in another minute I'm safely pulled over. Pop the hood...nothing strange happening. Get back in and drive the remaining 10 miles home. Temp stays at 210. Saw it climb up a little at one point, then quickly back to 210.

Any ideas what might be happening? Never any low coolant or other cooling system warnings on this truck before (about 57k miles on it). I have a hard time believing that the coolant was 260 degrees and dropped 50 degrees in 5 seconds.