@hawsk99gt I was searching around the internet for insight into our overheating problem, and I found
this thread that brought up a potential failure mode I hadn't thought of before:
From Post # 5 on the above thread:
This seems like it could make sense, especially if it's confirmed not to be related to the thermal management unit. Like caulk04 said, it might be internal at this point. I'm afraid my problem might be the same. When that uncontrollable temperature spike hits, it climbs FAST, like 2 degrees every 5-10 seconds. I have to catch it RIGHT when it happens and slow way down, or pull over entirely.
@Wild one , I know you're no stranger to transmission issues. What do you think of a transmission that isn't able to keep the torque converter locked. Would that lead to our overheating issues? Is that an easy fix (programming) or does that need a transmission drop and repair/overhaul? Or is a new transmission best?
Luckily, it only seems to affect me when I'm above 60 mph, so city driving is okay. And the few times it's happened, I've caught the temperature before 230 F. But long trips limited to 60 mph is kind of grueling. I'd want to get this repaired. Are there trustworthy places that work on these transmissions? I can pony up if I know the job will be done right... I've kept good care of the truck since 17,000 miles. She's got a lot of life left in her.