Water To Antifreeze Ratio Chart. But in climates where the temperature regularly falls below 0℃, a higher amount of antifreeze in the coolant is required. In climates where temperatures drop below 0℃ for a longer period, mixtures closer to 60% antifreeze and 40% water are better suited to keep coolant from freezing.

Mixtures with a ratio of 50:50 work almost in every climate. In climates where temperatures drop below 0℃ for a longer period, mixtures closer to 60% antifreeze and 40% water are better suited to keep coolant from freezing. But in climates where the temperature regularly falls below 0℃, a higher amount of antifreeze in the coolant is required.