1997 Chevrolet Blazer Owner's Manual - Page 74

Engine Coolant Heater (Option) In very cold weather, 0°F (- 18O Cj or colder, the engine coolant heater can help. A CAUTION: 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 rated for at least 15 amps. 4. Before starting the engine, be sure to unplug and store the cord asit 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. Insteadof trying to list everything here. we ask that you contact your GM dealer in the area where you'll be parking your vehicle. The dealer can give the best advice for that you particular area. You'll get easier starting better fuel economy during and 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. 3. Plug it into a normal, grounded 110-volt AC outlet. ~ 2-17