Antifreeze is in your system for four very important reasons.
The first, seemingly obvious, is anti freeze. You don’t want your car engine freezing up, especially if you live in northern States or if you’re taking a trip to the mountains.
Glycol is much better for antifreeze than water is since its freeze point is much lower than that of water.
But the mixture of glycol and water will provide optimal protection.
–Signed, The Professor