First of all, the thermostat does nothing to cool the engine, it is a device that determines when coolant is allowed to flow between the radiator and the engine. It also regulates how fast the coolant moves through the engine.

Secondly, a 50/50 mix cools more efficiently than 100% antifreeze. Use distilled water, not tap water!

Thirdly, maybe glycol's boiling point is higher, but it is heat transfer we are after here. If pure glycol were running through the system at 300 degrees, your motor would still be toast.

Glycol lowers the freezing point of the water it is mixed with, not the other way around.

In the Nascar race, several engine failures were attributed to the overheating(Robbie Gordon comes to mind). Drivers don't get worried until over 220 degrees. Even then only for an extended run. Some drivers had to add water during the race.

Higher boiling temps and lower antifreeze protection can be obtained by going to a 75% antifreeze mixture. However, no manufacturer of either antifreeze or auto says to use 100% glycol,,,,,and in fact specifically says not to!!! I for one would not appreciate a mechanic putting something in my car that was specifically recommended against by the manufacturers of both the car and the product. Would I then get the speech about how you know so much more than all of the engineers, designers, and manufacturers?

At the very, very least you are wasting money.

Oh, and tcoff,,,,,is maybe a cat peeing on your radiator?????