1996 Buick Riviera Owner's Manual - Page 81

NOTICE: Your engine is designed to wbrkwith the electronics in your vehicle. If you add electrical parts oraccessories, YOU could change theway the engine 0perates;Before adding electrical equipment, check with your.dealer. I you don't, f your engine might not perform properly. If you .ever have to have yourvehicle towed, see the part of this manual that how to do it tells without damaging your vehicle. See "Towing Your Vehicle"in the Index. E.ngine Coolant Heater (Option) In very cold weather, "F (-18 'C) or colder, the engine 0 coolant heater can help. You'll get easier starting and better fuel economy during engine warm-up. Usually, the coolant heater should be pluggeda minimumof in four hours prior to starting your vehxle. To use the coolant heater: 1. Turn off the engine. 2. Open the hood and unwrap the electrical coTd. 3. Plug it into a normal,grounded 110-volt AC outlet.