When stuck in a car during a snowstorm should you only turn your engine for short periods and crack?

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http://
www.yourepair.com/880/how-to-surviving-a-winter-snow-storm-trapped-in-your-car.html

https://
www.wikihow.com/Survive-Being-Trapped-in-Your-Car-During-a-Snowstorm

https://
weather.com/safety/winter/news/blizzard-survival-tips