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Icy windscreen - warm water safe to use?


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I tend to use luke warm water to clear an icy windscreen. In 35 years, no issues. I occasionally use a scraper but I won't use de-icer as I see that as lazy and an unnecessary expense.

I was admonished by a vehicle recovery driver last week, he claimed it could crack the windscreen. 

Is that true? I doubt if luke warm would, I don't use boiling water but could that shatter a windscreen?

The only car I have with a heated screen is the 340R which ain't often icy........

Justin

 

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Personally, I find that water out of the cold tap is more than enough. Unless the ambient temperature is really low (ie -5 or below), then the temperature differential is more than enough to melt the ice.

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  • Gold FFM

I do wonder what a scientific answer would be....not expecting one but I'd like to understand the genuine science of hot water on laminated or toughened cold glass. 

Justin

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@C8RKH Known as Mpemba effect. Some experiments were done on the telly a few years ago that showed hot water freezing faster than cold but the mass of the water had to be large enough to allow convection currents to form (they used buckets of water). So although it may be interesting it may not be relevant to water being poured on screens

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Pats electric car with phone enabled defrost :D

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Wife's car has heated front screen. But does not get too much use down here in Devon. 

Certainly would not pour hot water on an icy screen or cold water from a hose or similar on a baking hot screen in full sun.

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