anti scale, anti freeze, anti corrosion, better heat transfer and higher boiling point, i think at a 50/50 mix you're looking at about 110 c, and at 100% its closer to 200 c. Apparently though its best anti freeze mix is 60-70% if you're looking at frost prevention. Min 25% for anti scale/anti corrosion.
What temp does the thermostat open/fan come on and light come on with fazers?