Holson, like I always tell people, your best bet for cooling performance is actually 100% water...although this isn't necessarily good for corrosion resistance.
If I really wanted to carry this all the way, I'd run 100% distilled water and the *appropriate* amount of water wetter (aids in cooling PLUS adds corrosion inhibiters).
According to tests, this config can allow a motor to run 10-20F cooler than the standard 50/50 mix.
If your system still gets too hot after doing this, then something in your cooling system is seriously messed up.
Naturally, you don't want to run this type of config once the temps start dipping near the freezing point.
Oh ja....pop in one of those new fangled AutoZone thermostats
