Thoughts on pinging

[dank]

Bd, you are way beyond me in these things, so I'm sure you have it worked out. I only mentioned the boiling point elevation because even though the fan comes on and prevents a temperature spike high enough to boil water/antifreeze mixture, the fact that it kicks in at 212 doesn't mean the temp can't go above 212. It just doesn't go above the temp at which the mixture, taking pressure into account, would boil. You are talking about a change that will decrease that boil-over temperature. Since blackbody radiation varies as the cube of the temperature differential, and that augmented by the fan is what you are relying on in moving heat from the radiator at a stop, I would be concerned about any change that significantly lessens the boiling point of the solution since the higher heat radiation rate at higher temperatures may be part of what makes the system function as a whole. Probably an insignificant concern.

Just wanted to explain why I made the earlier comment. I bow to your greater understanding of these systems and look forward to learning the results. It will be great if it solves the problem.