Frozen car windows never happen to you at the right time. Always in the morning when you are just not awake long enough for this hassle and preferably when you are already running late for work. Logical, because car windows usually freeze at night. It would be very relaxing if you could pour boiling water on your frozen car window. At least that’s getting there. Anyone who has been wandering the internet for a while knows that this is a bad idea.
If you look for videos on YouTube, you will come across a lot of videos of people pouring boiling water on their windshield without any problems. At the bottom of the page you can see a video of someone pouring boiling water over his frozen car window ten times in a row. The diamond even has an asterisk. Clever, by the way, how he grabs the metal pan without a plastic handle without gloves. In addition to this video, there are hundreds more that prove it doesn’t have to go wrong.
Boiling water on frozen car window: really that bad?
The science is simple. In the places where the glass becomes hot because of the water, it expands. In other places where the glass remains cold, do not expand it. This puts stress on the glass and can cause it to crack. So it is obviously not the case that things always go wrong; often it just goes well. When the ANWB threw boiling water over a frozen window four years ago as an experiment, it simply cracked. Various companies that replace windows (and would therefore benefit from demolishing the window) also advise against using boiling water.
So, what about?
Think of it as someone who claims that Russian roulette doesn’t kill after trying it three times. You can always be lucky. You can even win a hundred individual games of Russian roulette, although the chance is quite small. In many cases, it will probably end well if you empty the kettle over a glass pane, but you will always run a risk. The colder it is outside, the greater the chance that the window will crack. We are already looking forward to the reactions on Facebook from PHEV and EV drivers who would like to say that they simply preheat their car.