2012 Chevrolet Impala Owner's Manual - Page 202
2012 Chevrolet Impala Manual
Page 202 highlights
9-18 Driving and Operating Engine Heater The engine coolant heater can provide easier starting and better fuel economy during engine warm‐up in cold weather conditions at or below −18°C (0°F). Vehicles with an engine coolant heater should be plugged in at least four hours before starting. { WARNING 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 will not 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 as it was before to keep it away from moving engine parts, and prevent damage. The length of time the heater should remain plugged in depends on several factors. Ask a dealer in the area where you will be parking the vehicle for the best advice on this. Retained Accessory Power (RAP) These vehicle accessories can be used for up to 10 minutes after the engine turned off: . . Audio System Power Windows To Use the Engine Heater 1. Turn off the engine. 2. Open the hood and unwrap the electrical cord. The cord is attached to the diagonal brace on the driver side of the engine compartment. 3. Plug it into a normal, grounded 110-volt AC outlet. The radio will work when the key is in ON/RUN or ACC/ACCESSORY. Once the key is turned from ON/ RUN to LOCK/OFF the radio will continue to work 10 minutes or until the driver door is opened. The power windows will continue to work for up to 10 minutes or until any door is opened.