My 6.0 is running around 210 unloaded and will spike up to 250 wile driving. Ok some back ground..... About a month ago i was towing my 5er home from Nashville when the temp spiked up to 260. Pulled to the side and found my degas bottle had split. Finally made it home and replaced the bottle and the temps were still around 250. after taking a harder look i noticed the Fan wires were shredded. I then replaced the fan with a mechanical fan, new thermostat and fresh coolant. last week i took a 1200 mile trip pulling the camper and couldn't get over 70 mph before the temp would spike up......... all help and suggestions is appreciated.