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Message: [QUOTE="dsrace, post: 1551483, member: 33459"] i never gave them a chance to stabilze. as soon as i saw 230* climbing that 5 mile long pass, i dropped a gear and slowed down. it never went over 230* and thats on a auto meter gauge. so i have read a few posts on the 6.0 fan but never read if it was a large step up or not. i should probably mention that the trips where i hit 230* were before i replaced the cooling system. i had noticed for a couple of years ( remember i only use the truck to tow the toyhauler so 7k miles a year) that the temps were slightly higher than normal. this is the 3rd powerstroke i have owned over the years clear back to 1992. i have seen where the center of the radiator has developed build up and blocks some heat to the fan clutch. my thermostat housing was rusting again anyway so time to change it. i bought a billet housing and a stock thermostat. i decided to purchase a new radiator from ford as well as a water pump, gasket and fan clutch. i replaced the radiator, fan clutch, water pump , thermostat and housing. the water pump never leaked and had been replaced at 60 miles, i have the receipt from prev owner. when i pulled the pump the bearing had just enough slop that there is a 1/4 circle scuffed into the block face. not deep and you could see that the edges of the blade had touched. no sharp edges and just surface scuffing so i installed the new pump. def why i was running 10 to 15* warmer than normal imo. so now, while towing 11k lbs on a 85 - 95* ambient temp day, i run at 205* pretty solid according to the autometer gauge. i don't drive it empty much but empty it hangs run right where it did at 80k miles which is about 195*. this is why didn't put that 203* thermostat in that i have read about. i primarily tow with it and wasn't sure how that would work on hot days. i could be wrong and maybe it would run at the same temp. my fan clutch does lock up and unlock on hot days loaded , i set the cruise at 75 mph towing 11k lbs btw. i wonder how much more flow the 6.0 fan produces? [/QUOTE]