1996 Oldsmobile Bravada Owner's Manual - Page 168

A CAUTIOh: - - Snow can trap exhaust gases under your vehicle. This can cause deadly CO (carbon monoxide) gas to get inside.CO could overcomeyou and kill you. You can't see it orsmell it, so you might not know it is in your vehicle. Clear away snow from of your vehicle, especially any around the base that is blocking your exhaustpipe. 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 of the 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 fairly vigorous exercises every half hour or so until help comes.