Arild, believe it or not but straight anti freeze has a higher freezing point than mixed anti freeze. ie straight will freeze at -20 while mixed will be good for -30. (these are just random numbers I used for illustration)
Anti freeze is designed to be mixed with water. If you are experiencing cold snaps that low another idea is to put a piece of cardboard in front of the rad. You may find that you have to secure it to the grill as the idea is to slow the incoming air, not block it from going thru the rad fins. Rob > Now I got an ice problem! > Engine has -30C anti-freeze in the coolant circuit. .... > but ..... > This morning it froze in the radiator. Why? Because at highway > speeds it > chilled to -60C and even full strenght anti-freeze isn't good > enough for > that. >
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