1998 Cadillac Eldorado Owner's Manual - Page 227

I A CAUTION: Snow cantrap exhaust gases under your vehicle. This can cause deadly CO (carbon monoxide) gas to get inside. CO could overcome youand kill you. 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, especiallyany that is blockingyour exhaust pipe. And check around again from time to time to be sure snow doesn't collect there. Open a windowjust a little on the side of the vehicle that's awayfrom 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 signalinglater 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 engineagain and repeat this only when you feel really uncomfortable from the cold. Butdo it as little as possible. Preserve the fuel as longas 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