When the fan clutch fully engages, your truck will sound like a big rig with how loud that fan is. Seriously, it almost overpowers my stacks under moderate acceleration. You will KNOW when that thing is on. FWIW, my fan has ONLY ever come on when my coolant was really low, or one time when towing an enclosed trailer up hill with extreme street on and my foot the floor. Got a few warning beeping things on the dash for that one...

 

Well hope I can sort it out! Warmer weather and towing will be a treat!!

 

So what exactly is an "ok" operating temp for ect and eot? From what I understand you want to see a max of 15 degrees difference between the two. Correct, or no? I have 2006 6.0 all stock. Edge insight, 114k miles

 

Correct 15 between, but we never did get what is normal operating temp? Or what is hot? What temp should be shut down? That is still the unknown?? When does damage occur?

 

Well a lot of it depends on information that is lacking... Not every truck will be the same. We all use our trucks differently, in different conditions, some tow, some don't... there's a lot of factors there. Your truck will beep at you and throw warning lights up on the dash once your coolant gets too hot.