BigJim,
<img src="/forums/images/graemlins/lol.gif" alt="" /> I love these discussions! You're wrong about this issue, and I know you ain't going to admit it! <img src="/forums/images/graemlins/smile.gif" alt="" />
You continue to ignore the unique characteristics and chemical properties of water! Water has to absorb a tremendous amount of heat energy to go from a liquid phase to its gaseous water vapor phase. Nothing else like it! Your alcohol, glycol, has a higher boiling point, but it can't hold a <img src="/forums/images/graemlins/kewl.gif" alt="" /> to water in absorbing and transfering heat from the "fire"! Considering the temperatures we control the coolant just before it enters the radiator, your straight/neat glycol coolant has been squeaking by possibly due to the thermostat being constantly open to sustain a greater flow per hour through the block to compensate for its lower capacity to absorb heat compared to a glycol treated water solution! There ain't no amount of testing/readings at the engine's effluent port going to show possibly the reduced heat transfer capacity of your neat glycol coolant compared to the treated water solution's heat transfer capability.

a 70/30 mixture is 70 parts glycol to 30 parts water mixture to depress the freeze point of water to allow Tom to park his snow-plowing rig ouside at night during NY State winters, and yet, have liquid coolant and no ruptures in the coolant plumbing system when he goes to start the rig in the morning.
<img src="/forums/images/graemlins/lol.gif" alt="" /> <img src="/forums/images/graemlins/cheers.gif" alt="" /> <img src="/forums/images/graemlins/lol.gif" alt="" />

Yes, the temperature where glycol self-ignites is up there a ways, something like 400 degrees F. You'd have to be in a fire to reach that temperature. But, you be careful around those tanker truckloads of chemicals around the ship channel, it's very unlikely, but if you crash into the right chemical spill, you could convert your glycol into an explosive! <img src="/forums/images/graemlins/lol.gif" alt="" /> <img src="/forums/images/graemlins/wink.gif" alt="" />