2003 Buick LeSabre Owner's Manual - Page 237

Run your engine only as longas you must.This saves fuel. When yourun the engine, make it go a little faster than just idle. Thatis, push theaccelerator 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 a while. 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 youfeel really uncomfortablefrom the cold. But do it as little as possible. Preserve the fuel as long as you can. Tohelp keep warm, you can get out of the vehicle and do some fairly vigorous exercises every half hour or so until help comes. If You Are Stuck: In Sand, Mud. Ice or Snow In order to free your vehicle when it is stuck, you will need to spin the wheels, but you don't want to spin your wheels too fast. The method known as "rocking" can help you get out when you're stuck, but you must use caution. If you let your tires spin at high speed, they can explode, and youor others could be injured. And, the transaxle or other partsof the vehicle can overheat. That could cause an engine compartment fire or other damage. When you're stuck, spin the wheels as little as possible. Don't spin the wheels above35 mph (55 km/h) as shown on the speedometer. 4-30