1996 Oldsmobile Silhouette Owner's Manual - Page 200

Snow can trap exhaust gases under yourvehicle. This cancause deadly CO (carbon monoxide) gas to get inside. CO could overcome you and kill you. You can't see it or smell it, so you might not know it is in yourvehicle. Clear away snow from around thebase of your vehicle, especiallyany that is blocking your exhaustpipe. And check around again from time to time to snow be sure doesn't collect there. Open a window just a little on the sideof the vehicle that's away from wind. This will help the keep CO out. Run your engine only as long as you must. This saves fuel. When you run the engine, make itgo a little faster than just idle. That is, push the accelerator slightly. This uses less fuel forthe 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 engineoff 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. 4-26