22 F250 7.3. Drove from IL to TN and back this weekend. Coming home the ambient temp was 95, the trans hovered around 215 (not towing) on the expressway driving ~ 73 but what's odd is the engine temp hovered around 185. When I got off the expressway and came to a stop it dropped to 178. Once I started driving, back up to 185.

On the expressway the trans was hitting 219 for periods of time.

Odd

 

So what’s odd about it? The thermostats are old-school, hotter fluid gets more flow mechanical devices. Not digital electronic control trying to lock operating temps to +/- 1°F.

The more accurate the monitoring gauges get the more people worry. It’s probably the main reason the automakers started going to the “idiot gauges” that lock the indicator into a spot in the normal range and then peg hot (or low/high) when conditions warrant.

 

I agree... Nothing odd about any of those temp numbers, especially at that ambient temperature... JMO

 

Sounds about normal for that truck configuration.

 

so now I've just noticed my 23 f250 with a 7.3l coolant temperature readings fluctuating from a high of 197 then when i let off it will drop down to 172 and that's after driving it for over an hour, i swear this thing use to be pretty consistent in the low 200 maybe getting down to 198