If your car breaks down during winter, turn on your hazard lights and safely maneuver your vehicle off the road if possible. Stay with your vehicle and call for help. Use a survival kit if you have one, including blankets, water, food, and a flashlight. It's also important to make sure the tailpipe is not blocked by snow to prevent carbon monoxide buildup inside the car. If you need to stay warm, run the engine for about 10 minutes each hour to conserve fuel.