1995 Cadillac DeVille Owner's Manual - Page 224

. ..., ... . :. . Run your engine only as long as you must. This saves fuel. When vou run the engine, make it go a little faster than just idle. That is, push the accelerator slightlv. This uses less fuel for the heat that you get and it keeps the battew 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 awhile. 4-3 1