2004 Cadillac Seville Owner's Manual - Page 85

Engine Coolant Heater Your vehicle may be equipped with an engine coolant heater. In very cold weather, 0°F (−18°C) or colder, the engine coolant heater can help. You will get easier starting and better fuel economy during engine warm-up. Usually, the coolant heater should be plugged in a minimum of four hours prior to starting your vehicle. At temperatures above 32°F (0°C), use of the coolant heater is not required. A. Engine Oil Dipstick Location B. Engine Coolant Heater Cord C. Transaxle Dipstick/Fluid Fill Location 2-27