2010 GMC Sierra 1500 Crew Cab Owner's Manual - Page 406

Blizzard Conditions Being stuck in snow can be in a serious situation. Stay with the vehicle unless there is help nearby. If possible, use the Roadside Assistance Program on page 8‑7. To get help and keep everyone in the vehicle safe: . WARNING: (Continued) . Turn on the Hazard Warning Flashers on page 4‑3. Tie a red cloth to an outside mirror. Open a window about 5 cm (two inches) on the side of the vehicle that is away from the wind to bring in fresh air. Fully open the air outlets on or under the instrument panel. Adjust the Climate Control system to a setting that circulates the air inside the vehicle and set the fan speed to the highest setting. See Climate Control System in the Index. . . . { WARNING: Snow can trap engine exhaust under the vehicle. This may cause exhaust gases to get inside. Engine exhaust contains carbon monoxide (CO) which cannot be seen or smelled. It can cause unconsciousness and even death. If the vehicle is stuck in the snow: . For more information about carbon monoxide, see Engine Exhaust on page 3‑58. Snow can trap exhaust gases under your vehicle. This can cause deadly CO (carbon monoxide) gas to get inside. CO could overcome you and kill you. You cannot see it or smell it, so you might not know it is in your vehicle. Clear away snow from around the base of your vehicle, especially any that is blocking the exhaust. Clear away snow from around the base of your vehicle, especially any that is blocking the exhaust pipe. Check again from time to time to be sure snow does not collect there. (Continued) . 5-30