Defrosting Car Windows: NASA Engineer Shares Surprisingly Easy Method

Written by Henrik Rothen

Dec.12 - 2023 2:37 PM CET

NASA Engineer Shares Surprisingly Easy Method.

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A former NASA engineer, who used to send spacecraft into temperatures of -270 °C, has revealed an "unexpected" method that makes defrosting car windows easy. This timely advice comes as many places experiences freezing cold temperatures, leaving cars frosted over in the mornings.

According to, motor experts at Eden Tyres and Servicing have shared a tip from former NASA engineer Mark Rober, which speeds up the defrosting process. It involves four simple steps that address both frost and moisture inside the car.

Rober's "unexpected" method starts with slightly opening your windows. The goal is to warm and dry the air inside the car so that any water vapor hangs in the air instead of sticking to the glass. He explained that this exchanges the warm, moist air with dry air from outside, resulting in a "neatly defrosted windshield."

First, Rober suggests turning the car's heater to maximum heat and full strength, as warmer air can hold more water. Second, by turning on the air conditioning, air circulates and pulls moisture out of the air as it passes over the cold coils of the unit.

Third, ensure that the internal air circulation is turned off (the button with an arrow inside a car icon), so that cold air from outside does not enter the car. Finally, open your windows briefly at the beginning to exchange the warm, moist air inside the car with colder and hopefully drier air from outside.

The decision to open your windows will depend on the weather outside the car, as it might be raining. In the comments, someone also suggested: "Lower the sun visors, as it traps more of the warm air against the screen."

Another person advised: "Wake up a little earlier, start your car, turn up the heat and defrost buttons, it should defrost in 10-15 minutes."