The recent thread on aluminum radiators inspired me to go back and look at some older discussions on radiators. One thing I saw mentioned frequently is that in warm climates, if cooling is an issue, you're better off running 100% water and maybe a bottle of water wetter, rather than the more common car mixture of 50/50 water and antifreeze. This is due to the better cooling properties of pure water.
So far so good. BUT... in addition to preventing your coolant water from turning to ice, isn't there another very important function of antifreeze? Namely, it keeps the innards of your radiator from rusting. I would think that running mostly or 100% water all the time would turn your cooling system guts to sludge... wouldn't it?