Hey Juan I hope you weee able to figure out this issue. It’s something I’ve been dealing with in my 2014 4.3 past couple month. Swapped thermostats, engine coolant temp sensor, coolant reservoir and heater core hose to try to fix the fans going on and the overheating. Mines now closer to 235 on a normal drive and pushing 260 on the highway. I’m sure whatever issue you had I have as well, wondering if you could shed some light for me