What is the boiling point of antifreeze?
by 
Chris Hansen
ANSWERS: 4
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It says on the bottle I would think. Plus, there are different types, so it's hard to say for certain.
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In the 1980s inventor Jack Evans discovered the advantages of using a waterless coolant. His final formulation is a mixture of ethylene glycol and propylene glycol. This coolant has a high boiling point of 370 °F and is not corrosive, solving many of water's problems including freezing. Most commercial antifreeze formulations include corrosion inhibiting compounds, and a colored dye (commonly a green, red or blue fluorescent) to aid in identification. A 1:1 dilution with water is usually used, resulting in a freezing point of approximately −40 °F (−40 °C). In warmer areas weaker dilutions are used. http://en.wikipedia.org/wiki/Antifreeze_(coolant)
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Pure Ethylene Glycol and Propylene Glycol mixture that 1980s inventor Jack Evans suggested as ideal is 370F but that's not normally used (http://en.wikipedia.org/wiki/Antifreeze) As for the individual Ethylene Glyc and Prop Glyc, I can do the chem math if you want.... and I really should I need the practice.
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It depends on the percentage of the water/anti-freeze mix. 70/30 is the preferred mixture for maximum heat/freeze protection. It is not a good thing to use straight anti-freeze in your system unless you are just "topping off".
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