[cdjnight]

It will freeze if you use straight water with it. Basically it works better with the more water content vs. antifreeze. So if you can get away with a 80/20, 70/30, 60/40 etc...mix then it will do better for you. Just look up the coldest day for your area of living and mix your water/antifreeze accordingly to make sure your system wont freeze. Then add the water wetter...I will add that anti-freeze also helps to keep engine parts from corroding and electrolysis from happening. At minimum you should flush it all out and do again each year to keep that from happening.