2003 Cadillac DeVille Owner's Manual - Page 260

Snow can trap exhaust gases unc,.' your CO (carbon vehicle. This can cause deadly monoxide) gas to get inside.CO could overcome you and killyou. You can't 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 your exhaust pipe. And check around again from time to time to be sure snow doesn't collect there. Open a window just a little on the side the o f vehicle that's away from the wind. This will help keep CO out. Run your engine on!y as !nng as you must. This saves fuel. When you run the engine, make it go a little faster than just iaie. 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 a while. 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 fairly vigorous exercises every half hour or so until help comes. 4-29