1993 Buick Riviera Owner's Manual - Page 76

Engine Block Heater (Option) In very cold weather, 0 F (-18 C)or colder, the engine block heater can help. You'll get easier starting and better fuel economy during engine warm-up. To usetheblockheater: A CAUTION: Plugging the cord intoan ungrounded outlet could cause an electrical shock. Also, the wrong kindof extension cord couldoverheat and causea fire. You could be seriously injured. Plug thecord intoa properly grounded three-prong 110-volt outlet. the cord won't If reach, use a heavy-duty three-prong extension cord rated for at least 15 amps. I. Turn off the engine. L. Open the hood and unwrap the electrical cord. 3. Plug it into a normal, grounded 110-volt outlet. How long should you keep block heater-plugged in? the of The answer depends on the weather, the kindoil you of have, and some other things. Instead trying to list everything here, we ask that you contact a Buick dealer in the area where you'll be parking your vehicle. The for dealer can give you the best advice that particular area. 74