I have a 2017 JKU that recently underwent lift/regear. I run 35s on a 3.5” lift and 4.56 gear ratio. I put on steel front/rear bumpers and sliders. Today I was driving uphill on freeway about 75-80 mph on a 7% grade for about 3 miles with A/C on. At the top of the climb my temperature light went off and I pulled to the side. Let the Jeep cool for 20 minutes and checked fluid levels/fan. Drove home another 40 miles with no issues and temp range between 203-231. Engine coolant half full, radiator level totally full, fan works, no leaks, and no mud caked on the radiator. Put a winch on two months ago and haven’t had issues off-road or on similar grade ascents until today. I am hoping it’s a one off event due to combo of A/C and uphill grade - but I would think I should have no trouble with 7% grade on an 80 degree day. Any thoughts or ideas?