Posted by Ralph [104.23.187.198] on Wednesday, August 20, 2025 at 21:57:49 :
In Reply to: Re: Goo in Radiator posted by Greg Coffin [172.68.1.162] on Sunday, August 17, 2025 at 09:01:31 :
Use Cummins cooling system cleaner called” Restore”
Follow the directions. The residue you’re seeing could be from mixing different kinds of antifreeze.