1999 Cadillac Catera Owner's Manual - Page 145

yellowblue Rear Window Defogger The lines you see on the rear window warm the glass. With your vehicle's engine running, press this button to turn on the rear defogger. NOTICE: Do not try to clear frost or other material from the inside of the rear window with a razor blade or anything else that is sharp. This may damage the rear defogger grid. The repairs wouldn't be covered by your warranty. Ventilation System The rear window defogger heats the rear window and both outside rearview mirrors. The system will automatically shut off after about 15 minutes. If further defogging is desired, press the button again. Do not attach a temporary vehicle license, tape or decals across the defogger grid on the rear window. The ventilation system supplies outside air into the vehicle when it is moving. Outside air will also enter the vehicle when the heater or the air conditioning fan is running. 3-7