Surge Tank Coolant Level Issue

[kozakvod]

I don’t believe that it’s a situation with improper pins connector wires because it was working just fine and then it wasn’t and two separate sensors give me the exact same codes.

Everything was fine until 2 weeks ago I have a hose rupture drained all but a gal or so of coolant out by the time i got it shut down. Replaced the hose filled coolant back and everything was fine until day before yesterday. When i pulled to old sensor it was covered in a white powdery coolant. I thought that was odd. Should be clean as best as I can figure.