seems a little high. the trick is to slow down to a lower gear till you can keep the temp under control. also no a/c if your running it.

sucks but you can live without it on for a few miles.

Yeah, that's too hot, is it losing coolant out the overflow when you do this? What pound pressure cap is on your cooling system? Did you try dropping a gear or is that out of the question?

way too hot, when your fan kicks on (210 or less) it should start bringing the temp down immediately. I'm not even a big "fan" (hehe) of the fan not kicking on til 210, I think it should come on at 200 or 205. but they set it that way for fuel economy.

Good thing your running an older truck. My 05 shuts down at about 225-230. Did that several times last week. Them I found a pin hole in my t- stat housing. 1300 dollars later I am still running about 215-220. Don't run it hot or you can and will blow a head casket and that is very expensive to have fixed

Even in 100deg wheather your cooling system should be able to keep up with the fan on,sounds like you have something going on with your cooling system. what temp does is run at on the flat? try to keep it under 220 for sure even on a hard pull, if you have to go get the fan on a few miles ahead of the hill to cool it down and down shift to keep rpm's high so the engine is not working, also that will give you more water pump flow. at 240 you can cause some damage.

I do turn off ac and turn on fan before the grade, running on the flats it runs 190, I do drop gears to accommodate for the heat issue. sometimes I stop and let her cool down then go on

i turn the fan on before hitting the grades too.

my truck don't like the heat either. switching brand of oil helped quite a bit. was told the turbo would be the reason. so, hopefully it runs cooler with the rebuilt.

Originally Posted by roamaround

anyone know what's too hot for water temp for climming a hill in 105 deg weather 350 big cam cummins without intercooler..... just an after cooler 1985 pete gets to 240 degkinda scared

drop gears and keep rpm up and turbo boost at a lower rate.