1997 Pontiac Bonneville Owner's Manual - Page 76

Engine Coolant Heater (Option) To Use the Coolant Heater 1. Turn off the engine. 2. Open the hood and unwrap the electrical cord. 3. Plug it into a normal, grounded 11O-volt AC outlet. m A CAUTION: In very cold weather, 0 OF (- 18 C) or colder, the engine coolant heater can help. You'll 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. O Plugging the cord into n ungrounded outlet a could causean electrical shock. Also, the wrong kind of extension cord could overheat and cause a fire. You could be seriously injured. Plug the cord into a properly grounded three-prong 110-volt AC outlet. If the cordwon't reach, use a heavy-duty three-prong extension cord rated for at least 15 amps. 2-23