I have no earthly idea how to search for this particular issue, so please forgive me if this has been talked about before. I just recently bought a 2014 Expy EL 5.4l with approximately 90k miles on it. It’s in relatively good condition all things considered. Issue: Yesterday I was sitting in a drive through on a rather hot day (NE FL inland). I noticed my radiator fans were at full speed, which I thought was regular considering the hot day. While waiting for food, I watched the temp gauge slowly climb - we got the food and started to drive, but then the temp gauge red lined and the display on the instrument panel showed the temp warning. No CEL at all. I then got on the road and drove, thinking the car would cool down because air is now moving freely. The temp gauge went back down to normal (mid way) and it didn’t rise again through the rest of the hot day. I don’t remember if the fans were still on full blast as I didn’t realize this was going to be a reoccurring issue. Today while driving into town, the temp gauge did the same thing - but this time it was a bit quicker in rising. The fans kicked on only a few minutes after driving (slow speed to get out of the neighborhood, then up to 65-70mph, back down to 35mph in the city). The temp gauge red lined, the warning popped up, but this time we had already reached our destination and the car was turned off. We made another short trip and the temp gauge went from normal to rising while at idle. The fans were on again at full blast. I turned the car off, then back on when we left. While driving at highway speeds, the temp gauge went up again, but this time I turned the heat on (up to 80 on the driver side). The temp gauge normalized and was fine, but the heat was barely warm, not 80. I haven’t checked the coolant level as I’m currently typing this in bed, but I will tomorrow when I get a chance. When the temp goes up, the AC gets really cold. I haven’t noticed a performance difference in the vehicle. The temp gauge seems to red line, then go back down to normal and stay there for the remainder of the trip. No CEL yet. An internet search with my limited knowledge/terminology only turns up F150 overheating issues. Any ideas or perhaps links to a previous post about this issue? Thank you in advance!