Surge Tank Coolant Level Issue

[kozakvod]

Truck: 2014 Pete 388 ISX15

Yesterday in central OK panhandle I got a CEL and low coolant level fault. I immediately looked to my temp gauge it’s reading 180, odd. I pull over open the hood, surge tank full, no leaking coolant anywhere and can’t smell any. I closed everything up and drove on to Lamar CO. The only thing I managed to do was to jump the connector and that got rid of the immediate fault and alarm. Drove on to Colorado Springs and back to Amarillo stopping a couple times to check everything, all okay. Stopped at peterbilt in Dalhart bought a new level sensor. Get to Amarillo install new sensor and code comes back on. I pulled the connector fault goes off, without jumper. Pulled sensor plugged in the connector, no CEL this time but low coolant alarm only comes on. Plug sensor into surge tank and I get CEL and low level alarm.

The old sensor was goodly covered in white powder residue, obviously dried coolant, should be clean shouldnt it? I blew air up inside to clean it out, still same codes.

I don’t think my wiring is the issue simply because it gives me the correct alarm and or with CEL depending upon sensor location.

Now I wonder, perhaps its the floating ball inside the surge tank itself, which means replacing the surge tank?

Thoughts?