1996 GMC Jimmy Owner's Manual - Page 72

Engine Coolant Heater (Option) In very cold weather, 0°F (- 18OC) or colder,the engine coolant heater can help. You'll get easier starting and better fuel economy during engine warm-up. Plugging the cord into an ungrounded outlet could cause an electrical shock. Also, wrong the 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 cordwon't reach, use a heavy-duty three-prong extension cord rated for at least 15 amps. 4. After you've used the coolant heater, be sure to store 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 parking your vehicle. The dealer can give you the best advice forthat particular area. 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. 2-15