1998 GMC Suburban Owner's Manual - Page 93

Engine Coolant Heater(If Equipped) In very cold weather, 0°F (- 18°C) or colder, the engine coolant heater can help. 3. Plug it into a normal, grounded 1 IO-volt AC outlet. 1 Plugging the cord into an ungrounded outlet could cause an 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 cord won't reach, use a heavy-duty three-prong extension cord ratedfor at least 15 amps. 4. Before starting the engine: be sure to unplug and store the cord as it was before to keep it away from moving engine p~u-ts. you don't, it could be damaged. If How long should you keep the coolant heater plugged in'? The answer depends on the outside temperature, the kind of oil you have, and some other things. Instead of trying to list everything here, we ask that you contact your dealer in the area where you'll be parking y o ~ ~ r vehicle. The dealer can give you the best advice for that particular area. 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. To Use the Engine Coolant Heater 1. Turn off the engine. 2. Open the hood and unwrap the electrical cord. The engine coolantheater electrical cord is located on the driver's side of the engine compartment, near the power steering reservoir. 2-15