1997 Chevrolet Tahoe Owner's Manual - Page 220

You can run the engine to keep warm, but be careful. I _ Snow can trap exhaust gases under your vehicle. This can cause deadly CO (carbon monoxide) gas to get inside. CO could overcome you and kill you. You can't see it or smell it, so you might not know it is in your vehicle. Clear away snowfrom around the base of your vehicle, especially any that is blocking your exhaust pipe. And check around again from time to time to be sure snow doesn't collectthere. Open a window just a little on the side of the vehicle that's away from thewind. This will help keep CO out. Run your engine only as long as you must. This saves fuel. When you run the engine, make it go little faster a than just idle. That is, push the accelerator slightly. This uses less fuel for the heat that you get and itkeeps 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 run for awhile. If you have a diesel engine, you may have torun it at a higher speed to get enough heat. Then, shutthe 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 aslong 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. 4-41