Chemical makeup and temperature extremes of engine antifreeze. … At -36 degrees Fahrenheit (that’s -38 degrees Celsius), antifreeze and coolant will start to solidify, making it very difficult for your engine to turn over.

Will pure antifreeze freeze?

The name “antifreeze” might trick you into thinking the coolant cannot freeze at all. But in actuality, pure antifreeze, which is ethylene glycol, will freeze between zero and minus five degrees Fahrenheit. Only by mixing antifreeze with water can you lower that freezing point.

What temperature does 50/50 antifreeze freeze at?

BOILING & FREEZING POINTS However, when you create a 50/50 mixture using water and ethylene glycol, the boiling point rises to 223°F (106°C) and the freezing point lowers to -35°F (-37°C).