Originally Posted by AfternoonShift
I've never heard of a windscreen cracking because of that lol
you can't be serious.
If its really cold below 20f, I'll wait a few mins then go.
If there is a chip or a crack already on the glass the sudden heating or cooling will cause it to propagate and spread across the windshield fairly easily. Also pouring warm water over ice cold glass can cause it to break sometimes also. Its about the sudden stress induced across the glass.
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