1998 Chevrolet Express Van Owner's Manual - Page 189

'A CAUTION: Snow cantrap exhaust gasesunder your vehicle. CO This can cause deadly (carbon monoxide) gas to get inside.CO could overcomeyou and 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 baseof your vehicle, especially any that is blocking your exhaust pipe. And check around again from time to time tosure snow be doesn't collect there. of Open a window just a little on the side 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 it fuel. When you run the engine, make 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 (or batteries) charged. You will need a well-charged battery (or batteries)to restart the vehicle, and possibly for signaling later on with your headlamps. Let the heater runfor a while. you If you have a diesel engine, may have to run it at a higher speed to get enough heat. Then, shut the engine off and close the window almostall the way to preserve the heat. Start the engine again and repeat this only when you feel really uncomfortablefrom the cold. But do 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 houror so until help comes. 4-26