mbt is correct...

dagdag lang...
-pure ethylene glycol boils at 187.2 degrees Celsius
-water boils at 100 degrees Celsius

-pure ethylene glycol freezes at -13.3 degrees Celsius
-ethylene glycol with 50% water solution freezes at much lower freezing points = -36.6 degrees Celsius
-water freezes at 0 degrees Celsius
-tropic temperatures don't go below 0 degrees Celsius...the anti-freeze property of ethylene glycol is just a bonus for users in the tropics...