2010 Chevrolet HHR Owner's Manual - Page 187

The rear window defogger turns off approximately 15 minutes after the button is pressed. If turned on again, the defogger only runs for approximately seven minutes before turning off. If the vehicle speed is greater than 80 km/h (50 mph) and the rear defogger is on, it remains on as long as the speed is greater than 80 km/h (50 mph). The defogger can also be turned off by turning off the engine. For vehicles with the remote start feature, the rear defogger automatically turns on if it is cold outside. When the vehicle transitions out of the remote start mode, the rear defogger turns off. See Remote Keyless Entry (RKE) System Operation on page 3‑4 Notice: Do not use anything sharp on the inside of the rear window. If you do, you could cut or damage the warming grid, and the repairs would not be covered by the vehicle warranty. Do not attach a temporary vehicle license, tape, a decal or anything similar to the defogger grid. Outlet Adjustment Turn the outlets and move the outlet vanes to change the direction of the airflow and to open and close the outlets. Operation Tips . Clear away any ice, snow or leaves from the air inlets at the base of the windshield that may block the flow of air into the vehicle. Use of non-GM approved hood deflectors may adversely affect the performance of the system. Keep the path under the front seats clear of objects to help circulate the air inside of the vehicle more effectively. . . Passenger Compartment Air Filter The filter removes dust and pollen from the air which is drawn into the vehicle. Airflow reduction is an indication that the filter needs to be replaced. The filter should be replaced as part of routine scheduled maintenance. See Scheduled Maintenance on page 7‑3 for replacement intervals. To find out what type of filter to use, see Maintenance Replacement Parts on page 7‑12. 4-21