1995 GMC Yukon Owner's Manual - Page 222

Run your engine only as long as you must. This saves fuel. When you run the engine, make it go alittle 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 headlights. Let the heater run for awhile. If you have a diesel engine, you may have to run it at a higher speed to get enough heat. 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 you feel really uncomfortable from the cold. But do it as little as possible. Preserve the 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 so until help comes. Power Winches If you wish to use a power winch on your vehicle, only use it when your vehicle is stationary or anchored. NOTICE: Using a power winch with the transmission in gear may damage the transmission. When operating power winch, always leave a the transmission inNEUTRAL (N). Use the regular brakes, set the parking brake, or block the wheels to keep your vehicle from rolling. 4-34