2011 Chevrolet HHR Owner's Manual - Page 140

To Use the Engine Coolant Heater 1. Turn off the engine. 2. Open the hood and unwrap the electrical cord. The electrical cord is located on the passenger side of the vehicle near the headlamp and the radiator. 3. Plug it into a normal, grounded 110-volt AC outlet. 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. Automatic Transmission Operation If the vehicle has an automatic transmission, the shift lever is located on the console between the seats. There are several different positions for the automatic transmission. { 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, to prevent damage. P (Park): This position locks the front wheels. It is the best position to use when starting the engine because the vehicle cannot move easily. 3-28