Two factors may make the w/a mix more likely to freeze up. Even the temperature is not low enough to freeze the w/a in you tank, the following conditions may make it more probable.
1. Sudden pressure drop of the mixture on the point of deivery (exiting the jet) will facilite the mix to freeze in mid air.
2. When the mix hits the cold rotor surface, it will increase the wetted surface area, the methanol (freezing point at -90C) will evaporate further and drop the mix further, the mixture will freeze solid.
I learnt that experience last winter when I sprayed washer fluid (with anti-freeze) onto the screen, as soon as the wiper spread the mix across the screen surface, the entire screen freezed up - have to stop and clean the screen by hand. I felt quite stupid.
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Richard L
aquamist technical support
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