Post by
Nismo_Freak »
https://forums.nicoclub.com/nismo-freak-u248.html
Fri Dec 26, 2003 3:20 pm
70/30 is what I use here in Texas... it works like a champ.
The coolant just raises and lowers the freezing and boiling temps of normal water so that you don't end up boiling over when it's 100 degs. outside and you don't wake up to a blown up radiator when the water freezes (since water expands when it freezes).
The "coolant" itself is Ethylene Glycol, a colorless syrupy liquid that has a sweet taste (I can attest to that, however the rest of the crap in coolant doesn't).
C2H6O21,2-dihydroxyethane Melting point: -13 C Boiling point: 196-198 C
Notice the difference... water has a melting point of 0 C and a boiling point of 100 C.
Long story short, the water does most of the actual cooling, the coolant is there to prevent the system from failing.