that run up toward 225 is normal, from all the techs i've talked to. pulling a 21' camper up over the trinity nat'l forest from redding to the coast gave the temp gauge a workout. even with rpm in mid 4k range for almost a mile in 95 degree heat i never went above 235. passed an H1 pulled over, towing nothing, with his hood up and steam floating out of the engine compartment. even with nothing being towed, mine goes up over 210, then drifts back. i don't worry about it anymore, i just keep an eye on it.