help me on this one cooling issue

thanks, but I thought I read on the antifreeze jug the protection ratio & the more antifreeze the better high & low temp protection?

 

drained out all coolant, put in 1 -1/2 gal simple green concentrate & 9 gal water. letting it run now. it at operating temp. 30 min should do it.

 

I did have a head gasket go long time ago.over a mil miles ago, but at that time coolant was pushing out of overflow hose from surge tank. it is not doing that now. I may have a small crack in head & maybe it expands & leaks when it gets hot? I don't know.

 

on a detroit, is it common or uncommon for the inpeller on water pump, or shaft to go bad, slip e.t.c.? I have heard cats this is not uncommon,

 

I tend to think head or head gasket too,

 

well this was a longer than expected. but I got it flushed out. took several times. a few hours to flush the cleaner thru than get it all out, but after all, I did not see anything of concern, I am leaning towards head issue. I will know on my next load how it does, no work tomorrow, will likely drop off at shop next week & have head rebuilt or whatever is done when having head work, & anything that should be done, like inj, cup, o rings, tubes, e.t.c.