1997 Chevrolet Express Van Owner's Manual - Page 80

Engine Coolant Heater (Option) 3. Plug it into a normal, grounded 110-volt AC outlet. A I /!\ CAUTION: Plugging the cord into ungrounded outlet an 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 rated for at least 15 amps. I In very cold weather, 0°F (- 18"C) or colder, the engine coolant heatercan help. You'll get easier startingand 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 Coolant Heater 1 . Turn off the engine. 2. Open the hood and unwrap the electrical cord. 4. Before starting the engine, be sure to unplug andstore the cord as it was before to keep it away from moving engine parts. If you don't, it could be damaged. 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 GM dealer in the area where you'll be parkingyour vehicle. The dealer can give you the best advice forthat particular area.