Quote:
Stranded in a Car
Tie something bright to the antenna as a signal to rescuers and raise the hood, if it is not snowing.
Move anything you need from the trunk into the passenger area immediately so you don’t have to go out into the elements multiple times.
Wrap your entire body, including your head, in extra clothing, blankets, or newspapers.
Stay awake. You will be less vulnerable to cold-related health problems.
Run the engine & heater for about 10 minutes/hour. Open one window slightly to let in air while doing this. Make sure that snow is not blocking the exhaust pipe—this will reduce the risk of carbon monoxide poisoning.
As you sit, keep moving. It’ll improve your circulation and stay warmer.
Do not eat unmelted snow because it will lower your body temperature and actually dehydrate you. The energy your body expends melting the snow inside you outweighs the benefit of the liquid produced.
Huddle with other people to conserve body warmth.
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Source.
This article explains everything you need to know. I would also suggest keeping a hip-flask of strong whiskey in the boot/trunk of your car just incase. A sniff of that stuff will help keep you awake.
If all else fails you could just get drunk and hope for the best.
