Getting warm 2011 Cummins ISX on International prostar

My Pete on a Hot summers day will clutch on clutch off at just over 200.

 

alex1990, sounds to me like it's doing what it is supposed to.if it is parked idling, eventually ,it'll get warm enough to engage fan.as long as it pulls temp back down enough for fan to shut back off.mine cycles between 200-205(fan on)190-195(fan off).bobtail it up your local grade.check ALL temps at top.water ,oil ,,exhaust. congratulate yourself. now go earn back all the money you just spent.good luck

 

I somewhat disagree. It’s his truck and just did an overhaul and is acting odd to him compared to how it used to act. Plus it’s almost winter time. I know all trucks are different but on 60 degree most trucks won’t get anywhere near 190 degrees just sitting at idle for an extended period of time before actually hitting the road. I think he low on coolant, air in the system or poor coolant circulation with new water pump

 

10-4 can't argue that. my bad

 

Whats the outside temps where you are at? What was the normal idel temps before the rebuild? I know my motor is years older than yours and to be honest, i have never driven newer model trucks. I always drove preemission cat motor trucks or preemission mack trucks. I'm very sensitive to coolant temps and what it is doing because i have had cooling problemns in the past. Days like today the temp got up to 50 degrees. I haven't ran my truck in 4 days so i went out and started it and put at high idle at 1000 rpm for 30 minutes just to let her run. The truck barely made it to 180 and i have new everything in it. New fan clutch, thermostats, fan clutch solenoid etc. This has always been the norm for me especially on a non hot summer day. in these fall and winter months, you shouldn't be hitting 210 degrees till you get out on the road and working that motor but like i said, i have no experience with emiisions motors with egr's and dpf and etc. So maybe I'm commenting on the wrong thread and things are different.

 

I have the same truck and engine and the description points to a bad thermostat. I know it was replaced but new parts can be bad right out of the box. Mine was doing the same thing and the problem was the thermostat barely cracking open.

Take the thermostat out and put it in a pot of water on the stove and turn on the heat. Put a kitchen candy thermometer in clipped to the pot or hold it. Thermostat should fully open at 185°

Neither low coolant or a bad cap will cause this although it does take several heat-cool cycles to get all the air out. Don't overfill the expansion tank more than halfway between the minimum-maximum lines; it will just spit out the excess past the cap. Test the thermostat before you buy a cap you might not need. If its a bad thermostat spend the money you saved on the cap on beer. You sound like you need a few!

Frank

 

that's so frustrating. i feel your pain i really do. gotta be something simple