07 dt466 egr overheats on freeway - Diesel Truck Forum - TheDieselGarage.com
Thread Details Posted by Old wrench, this thread has received 0 replies and been viewed 60 times.

LinkBack Thread Tools Display Modes
post #1 of 1 (permalink) Old 07-12-2019, 04:33 PM Thread Starter
Junior Member
Join Date: Jul 2019
Posts: 1
Points: 213
Thanks: 0
Thanked 0 Times in 0 Posts
07 dt466 egr overheats on freeway

New from Tucson and hoping someone can help with this issue.
Semi-retired mechanic with over 40 years wrenching. Still learning every day! This International 4300 only overheats on the hiway at 65mph or over. After checking for combustion gases in coolant (none), coolant flow, temp sensor function, codes, overheat history, leaks, t-stat function, viscous fan drive, belt slippage, radiator temp differential, exhaust and intake restrictions, missing air dams and air seals around radiator, and repairing or replacing as needed, we still had the overheat! Fuel settings and all parameters in programming at factory settings. It runs great! Desperation drove me to theorize that egr cooler was plugged with soot, thus allowing more combustion heat to develop, since one function of egr is to lower burn temps. Pulled egr cooler, it was indeed full of carbon. Cleaned, reinstalled, no more overheat! Truck had noticeably less power, but enough. Again, scanner showed all fine.
That was about a year ago. Last week, driver reported it overheated again on a run back from Yuma. As before, he backed off til it cooled, from 75 to 65 to 55, and came on in. Did a quick check of fluids, fan, combustion gas in coolant test, nothing. Took a morning run uphill at 75 mph and temps just keep on climbing! 55 or lower, all's fine. Monday or Tuesday, I plan to pull the egr cooler and check it, first.
Any ideas? I'm open to all suggestions, thanks!
Old wrench is offline  

Quick Reply

Register Now

In order to be able to post messages on the Diesel Truck Forum - TheDieselGarage.com forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:


Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

For the best viewing experience please update your browser to Google Chrome