1995 Buick Roadmaster Owner's Manual - Page 172

Run your engineonly as longas you must. This saves fuel. Whenyou run the engine, make go alittle faster it than just idle. Thatis, push the accelerator slightly. This uses less fuel for the heat that you get andkeeps the it battery charged.You will need a well-charged battery to restart the vehicle, and possibly signaling lateron for with your headlamps. Let heater runfor awhile. the Then, shutthe engine off and closethe window almost all the way to preserve the heat. Start the engine again and repeatthis only when youfeel really uncomfortable from the cold. But do as little as possible. Preserve the it 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 until help comes. so 4-26