I'll preface my plan with this:
I can't remember the last time, if there was a last time, I've ever heard my high speed cooling fan run.
Started over the weekend, but I either never saw the temp rise, or I missed it before the fan kicked on high. Nevertheless, I took it out this morning and drove 10 miles down the interstate with JScan showing me normal temps until I got off and onto a city street. It slowly crept up to 235 or so when the fan kicked up.
2014 JKU 3.6 with 140k miles. No codes.
Admittedly, it's been a minute since I checked the coolant level, so I'll check that and add as necessary and see what happens. I replaced the t-stat a few years ago when it was sticking open. I did notice the temp got up to where it normally runs much quicker than usual this morning. I'll also check the t-stat and make sure it's opening when it should.