Long time lurker....first time I've had to post.
First off I'd like to thank the community on this site for all of the great information I've recceived. Injectors, HPOP's EGR deletes, fueling issues, cooling issues, and all of the other little 6.0 problems that arise have all been much easier with the information contained here.
Now onto my current issue, the truck is a 2007 F350 KR. 98K miles on the clock and for the past 30K has had chronic ECT/EOT issues. Mechanics have previously replaced the oil cooler and EGR cooler 3 times (All three times VC-9 was used) all three times the ECT/EOT have remained high after the replacement.
The truck is mostly used pulling a little 6000lb tandem axle trailer, and on long hills it would overheat and puke. Even on flat ground it would almost always throw a wrench.
Here is where I come in, I pulled the truck apart. EGR delete, 4th Oil cooler, SCT livewire (so I actually have accurate ECT/EOT values now), Coolant filter, thermostat, and Oil cooler bypass valve were installed. Coolant system was flushed before the new cooler went in with water for an entire day, followed by restore and restore+( I did not mix them
) and a final flushing. I took the old oil cooler and ran 1 gallon of water through it in reverse out of curiousity and got lots of iron scale.
Now the ECT is great 188-198 (it was 100 degrees outside today and the ECT breached 200 for a few moments then settled back down to 196) but the EOT is still hanging out at 220-240. I even saw a 50 degree delta T yesterday (ECT 190/EOT 240) cruising at 75mph.
I am at a loss at this point, I do not know what step to take next. Any input would be greatly appreciated.