International 4300 DT466 Runs Hot Help

I own a 2007 International 4300 with the DT466 motor. I purchased it about 4 years ago and it has always ran on the hot side. I took it into an International dealer and had was told the EGR Cooler and Valve was causing the problem. Had that replaced. Didn't fix the problem. Truck would run hot IE 220-225, but not over heat. (55k miles ago)

Then a hose went out and the truck did overheat. I had to have an inframe rebuild done. Had this done at the dealer as well. At the same time I as the inframe I had the injectors replaced, thermostat, water pump, and radiator. Just to be sure of no problems. (40k miles ago)

Truck still runs hot. Turbo was replaced (50k miles ago), ICP/IPR replaced (15k miles ago), turbo actuator was never replaced so we replaced that, (15k miles ago), radiator has been power washed clean with oil cooler off, fan has been tested to be working properly (not just spinning), but the truck still over heats.

Not only does the truck overheat, I lose coolant. No leaks anywhere. Here's the goofy/frustrating part.

I can run the truck at about 65mph and I run at about 215 and don't lose coolant. If I go above 65 but below 70, I run hot at 220-225 and lose coolant. Faster I go, hotter it runs and lose more coolant. I would like to be able to cruise at 75 (truck easily can handle it).

We replaced the thermostat again just to be sure, no difference. Was told there is no aftermarket that operates at a lower temperature. International one opens at 192.

There is no signs of coolant being pushed out the overflow tank. My thought is, the truck runs very hot and is basically boiling or burning up the coolant. The big question is what is causing it to run this hot?

We own a moving company and take it all over the country. Approximately 1,500 miles one way. I hate to keep adding coolant, not only is it not fixing the problem, it's expensive and not good for the engine running that hot.

I'm sure we have done more to the truck then I can currently remember, but am looking for any suggestions or possibilities.

Any help is greatly appreciated.

Thank you

 

Ok, I'll have the mechanic check that all out. Going in for a PM tomorrow. I believe the main hoses are new, but definitely worth a shot. Not to also say something that has already been replaced is failing....but I figure a little less likely.....

 

Fan clutch.

I'm by far any type of mechanic and am very limited in knowledge/ability. My mechanic claims he tested it and it is operating properly. Any way for me to easily check it myself?

 

I've even thought of adding an additional electric fan operated by a switch, but there isn't any room to add one wit the fan assembly in the rear of radiator and the oil cooler in the front of it.

Don't know if it's possible to increase the overflow tank size and if so, if that would even make a difference.

 

I appreciate the suggestion, I will have the mechanic try that out as well.