2013 Pete ISX15 Overheating

I'd take a real hard look at all the coolers up front. They always seem to plug up around the sides first and the centre plugs up last.

What about poor coolant flow? Bad water pump? An internally plugged up/scaled up rad will have poor heat transfer.

 

Have you tried backing out of the throttle? When crossing the desert, even with the fan going and such, gotta keep an eye on the pyro, and if your coolant or oil are getting hot yet, just back out, no prize for being at the top first.

What do you consider high rpms?

 

Your cooling package is not keeping up with the heat generated from the engine. The fact that it still drops after the pull means it's still kinda working but not to full capacity. This equals one of two things.......poor air flow or poor coolant circulation. The first is the more likely.

Belts and tensioners in good shape and not slipping?

 

Has anyone messed with the ECM? Sounds like a "possible" bad delete. My other thought was carbon packing, or face plugging of the DPF and or the SCR system is plugged. If the ECM is running a factory tune, I would be inspecting the DPF and SCR units. When was the last time the SCR unit was serviced, inspected for cracks and or leaks? Has the filter been changed for the fluid?

You know you are destroying that motor running it like that? I would shut it down and figure this out, or you are looking at a $30,000 repair bill.

 

In my opinion the temps are not that hot. For a truck that is working. Not if short term temps? Did you burp the coolant system? Maybe it has an air pocket?
Is coolant staying pressurized?
I'm driving a 15, mx13 and when it's hot out, in the hills working. This truck loves to be at 215 coolant temp, and 250 oil temp. And I don't lug, I rev out when working hard to keep the water pump spinning.
Than when coasting the engine cools fast.
Many sensors go bad on the new engines. And often.
Which is one reason I despise them.

 

What rpms are you running at? Montana is pretty cool out so like another suggested, if it's been tuned it could be a bad one. Do you have a pyrometer?

 

How did you clean radiator? To do a good job, you just about need to remove condenser and CAC and blow out each individual component. I like to use garden hose first, then air. This set works well.
Also, Rawze is a very good source for ISX related info. I think they best things he stresses to drivers is know your equipment and maintain it. Curious if blowby and oil consumption has increased. How is your oil pressure? Last time you cleaned air management sensors, EGR cooler/valve, and DOC/DPF? This would help narrow down between cooling package unable to handle rejected heat or engine producing to much heat due to faulty sensors readings, plugged components, or wore out engine. In my opinion, the CM2250 is prone to a lot of issues like carbon packing, dropped liners, etc and need diligent maintenance to survive a million miles.