What is the warning?
I have been in contact with a company that makes a product called "Pro Blend" at
www.pro-blend.com Their products are endorsed and were developed for NASCAR.
They recommend 86'ing your coolant (as coolant traps heat) and replacing with Deionized Mineral Water and perhaps only a rust inhibitor. For extra cooling you can add a product (sold through AutoZone) as "40 Below". The link is to a guy "Skip Higginbotham" who has the world land speed record. He lives right here in Bastrop, TX. He swears by this stuff.
I'm going to give it a whirl this weekend.