1995 Cadillac Seville Owner's Manual - Page 227

Run your engine only as long as you must. This saves fuel. When you run the engine,make it go a little faster than just idle. That is, push the accelerator slightly. This uses lessfuel for the heat thatyou get and it keeps the batterycharged. You will need awell-charged battery to restart the vehicle, and possibly for signaling later on with your headlamps. Let the heater run for awhile. 4-36