Overheated and now coolant issues

ISX15 2350 (2016)
Deleted (cooler and vgt still intact)

So I blew a fan belt as I was coming down a steep hill with 150k pounds. Didn't know I lost the fan belt until I was heading up the other side when I saw the temp skyrocket. For some reason, the dinger was not working.

I got to the top at a pullout and the surge tank was full and pressured up...pushing coolant out. I slowly opened the fill cap a couple threads to release some pressure. Then i put on the spare belt and filled up the surge tank when I could get the cap off safely.
Now it keeps pushing out about a gallon....so I top off and drive about 15 miles and the dinger (which decided to work again WTF?!) tells me it's low again. Over and over.

Something tells me this $80 belt is gonna cost me a lot of money. F$$k!!

 

Sorry to hear it. I hope it turns out simple. Get one of those combustion gas checkers. Could be a head gasket. Might be the egr cooler. Hopefully it is cheap and easy. Best of luck.

 

Thanks. It'd be nice if it was cheap. Truck still runs good.
Got back to my shop and I can't tell what's going on. Almost seems like I might have a rad leak but hard to tell with all the coolant all over. But it sure makes a mess when the fan kicks on....and mists like crazy

 

Get a truck wash, park it, let it dry while off. then run it up to temp idiling, no ac so fan dosent spit things everywhere.

Then go hunting for a coolant leak. Might have ruptured a hose or a clamp might just need tightened, or your plastic tank may be cracked from overpressurization

 

It only seems to lose coolant until it gets to about 2 inches from the bottom of the tank. Then it seems to stay there.
Oil looks good, nothing from the exhaust stacks, heat still works in the cab, no pressure in the tank when I remove cap to add coolant.
After I first changed the belt, I thought it had air locks...so I wasn't surprised at the first couple times I had to add. But those air locks should have worked out after a couple hundred miles and 6 gallons of coolant.

 

Maybe a busted coolant tank.
I know on dd15 the always leak

 

We put a pressure tester on the coolant tank this afternoon and the rad is cracked somewhere at the top. Can't see where exactly unless we pull the shroud off. But it's really good leak.
So I'm going to get a new rad and hopefully my problem is solved. Going to price out a Duralite tomorrow because today is a holiday here. I'll ask what options they have because of the heavy weights....maybe something that cools better than the factory rad.

 

That's very good news.
At least it ain't engine related.

 

Would it be cheaper to have the rad repaiered? Or is it one of these new plastic jobbies?

 

Old belt must have cracked the tank, unless it had a weak spot already, and high pressure did it in. Either way, sounds like you figured it out. New radiators money well spent. American radiator did me right. Good product, best price. Radiator pros.com