The fluid in the radiator from freezing in the cold days and warm days to prevent boiling in water and ethylene glycol is a mixture of. Ethylene glycol (HO CH2CH2OH) is a highly toxic substance. The fluid in your radiator, this substance lowers the freezing temperature, boiling increases. The lowest freezing level is about -53 degrees.Ethanol and methanol are used as antifreeze in the amount of water vapor reduces harmony. Should make it a good setting for the antifreeze. Is more effective than ethylene glycol antifreeze that is permanent. But it is too expensive. Usually used in the market for anti-freeze and rust inhibitor is added to a water pump lubricant.