1996 GMC Sonoma Owner's Manual - Page 168

Snow can trap exhaust gases under your vehicle. This can cause deadly (carbon monoxide) gas CO to get inside. CO could overcome you and kill you. You can't see itor smell it,so you might not know it is in your vehicle. Clear away snow from around the base your vehicle, especially any of that is blocking your exhaust And check pipe. around again from time to time be sure snow to doesn't collect there. Open a window just a little on the side the of vehicle that's away from the wind. This will help keep CO out. Run your engine only as long as you must. This saves fuel. When you run the engine, make it go a little faster than just idle. That is, push the accelerator slightly. This uses less fuel for the heat that you get and it keeps the battery charged. You will need a well-charged battery to restart the vehicle, and possibly for signaling later on with your headlamps. Let the heater run for awhile. Then, shut the engine off and close the window almost all the way to preserve the heat. Start the engine again and repeat this only when you feel really uncomfortable from the cold. But do it as little as possible. Preserve the fuel as long as you can. To help keep warm, you can get out of the vehicle and do some fdirly vigorous exercises every half hour or so until help comes. 4-40