Social media users have been sharing posts that advise drivers to pour hot water on the windshield of their car to defrost it faster. This claim is false.
One post here reads: “Pour hot water on your windshield & it’ll defrost faster thank me later.”
The United States was hit with a winter storm this week that left usually warmer states unprepared against the cold. The weather has shuttered COVID-19 inoculation centers and hindered vaccine supplies (here).
The American Automobile Association (AAA) and the Automobile Association (AA) both recommend against using hot water on a windshield, which can crack or shatter glass due to the sudden change in temperature ( here , here ).
Instead, the AAA recommends starting the engine, setting the heater to “defrost”, adjusting the airflow to recirculate and moving the temperature control to full heat. As the ice melts, drivers can use a plastic scraper, the windshield wipers, rubber squeegee or a soft brush to remove the ice off the glass (here).
False. Pouring hot water over a car’s windshield during low temperatures can damage it, causing it to crack or shatter from the sudden temperature change.
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