Do not leave your car unless you know exactly where you are, how far it is to possible help, and are certain you will improve your situation.
To attract attention, light two flares and place one at each end of the car a safe distance away. Hang a brightly colored cloth from your antenna.
If you are sure the car’s exhaust pipe is not blocked, run the engine and heater for about 10 minutes every hour or so depending upon the amount of gas in the tank.
To protect yourself from frostbite and hypothermia use the woolen items and blankets to keep warm.
Keep at least one window open slightly. Heavy snow and ice can seal a car shut.