Running Hot on the Highway

I took the spring out of the lower hose and stretched it out. Then I pulled it through the hose with a string. The spring is now the full length of the hose. Now there is no way for it to suck shut. I have the 16 pound cap on there. Drained out two gallons of coolant and put distilled water back in to dilute it. If the roads dry up I'll take it out on the highway and see what it does.