Rebuild

[Smiling lemon]

I may have false positive but i am not sure. The test stays blue in its bottle. I just did a control where i am in the cab(i washed out the tester and dryed it) the liquid is blue until i suck air trough it for a couple minutes then it turns green.

Is there a faster easier way that can be done at the truck stop or at the house? I do not have anything that i could keep 20 psi in the cooling system, or really any where i can drop that oil pan.