So a couple weekends ago the TJ 4L started overheating while going 75mph, ~85 outside, with the A/C on. It got up to 240 at one point, so I stopped, opened the hood, let it air out, and went on my way without A/C. It got up to 230 again, so I stopped and got some belt dressing cus my handy phone has internet. I think that helped. It did it on my drive home going less than 60 later that week, again I think the belt dressing helped. There was some oil on the pulleys, I took off the belt, spun the pulleys and cleaned them a little, the only one with drag was the power steering but I assume that's normal. Autozone guy said my belt might be too tight. My coolant reservoir went down some from full but not empty so I assume it has enough.
Only happens when it's in the 80's, the A/C makes a difference, nothing is making noise, I'm kind of at a loss. I'm relying on my aftermarket thermometer, maybe I should hook up my laptop while I drive?