2005 Saturn Ion Owner's Manual - Page 127

Defogging and Defrosting Fog on the inside of windows is a result of high humidity (moisture) condensing on the cool window glass. This can be minimized if the climate control system is used properly. There are two modes to clear fog or frost from your windshield and side windows. Use the defog mode to clear the windows of fog or moisture and warm the passengers. Use the defrost mode to remove fog or frost from the windshield more quickly. For best results, clear all snow and ice from the windshield before defrosting. Turn the left knob to select the defog or defrost mode. Rear Window Defogger The rear window defogger uses a warming grid to remove fog from the rear window. The rear window defogger will only work when the ignition is in RUN. < (Rear): Press the button to turn the rear window defogger on or off. Be sure to clear as much snow from the rear window as possible. An indicator light above the button will come on to let you know that the rear window defogger is activated. The rear window defogger will turn off approximately 15 minutes after the button is pressed. If turned on again, the defogger will only run for approximately five minutes before turning off. The defogger can also be turned off by pressing the button again or by turning off the engine. 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 your warranty. Do not attach a temporary vehicle license, tape, a decal or anything similar to the defogger grid. - (Defog): This mode directs half of the air to the windshield and the side window outlets and half to the floor outlets. To defog the windows faster, turn the temperature control knob clockwise to the warmest setting. 0(Defrost): This mode directs most of the air to the windshield, with some air directed to the side window outlets and the floor outlets. 3-19