1993 Pontiac Bonneville Owner's Manual - Page 183

Your Driving and the Road If bu're Caught in a Blizzard (CONT) If You're Stuck in Deep Snow Then, shut the engine off and close the window almost all the way to preserve the heat. S a t the engine tr again and repeat this only when you feel really uncomfortablefrom the cold. But do it as little as possible. Preserve the fuel as long as you can. To help keep warm, you can get outof the vehicle and do some fairly vigorous exercises every half-hour or so until help comes. This manual explains how to get the vehicle out of deep snow without damaging it. See theIndex under Rocking Your Whicle. Run your engine onlyas 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 andit keeps the battery charged. You will need a well-charged battery to restart the vehicle and possibly for signaling later on with your headlights. Let the heater run for a while.