2009 Cadillac CTS-V Owner's Manual - Page 173

M / F (Recirculation/Outside Air): Press this button to switch between recirculation and outside air modes. The indicator light comes on to show which mode is being used. The recirculation mode recirculates and helps to quickly cool the air inside the vehicle. It can be used to prevent outside air and odors from entering the vehicle. Press the auto button to have the system select the best air delivery mode for the temperature setting. Recirculation is not available in the defrost mode and automatically turns off 10 minutes after defog is selected. This helps to limit window fogging in the vehicle. Using recirculation for long periods of time could cause the air inside the vehicle to become too dry or stuffy. To prevent this from happening, after the air in the vehicle has cooled, select outside air or press the auto button. The outside air mode pulls fresh air from outside the vehicle. Outside air is always selected in defrost mode to prevent fogging. Rear Window Defogger The rear window defogger uses a warming grid to remove fog or frost from the rear window. It only works when the ignition is in ON/RUN. = (Rear Window Defogger): Press to turn the rear window defogger on or off. The rear window defogger stays on for about 15 minutes, before turning off if the vehicle is moving at a slower speed. At higher speeds, the rear window defogger may stay on continuously. With each additional press, the defogger runs for about 10 minutes. The defogger can also be turned off by turning off the engine. The heated outside rearview mirrors turn on when the rear window defogger button is on and helps to clear fog or frost from the surface of the mirror. See Outside Heated Mirrors on page 2-54. Notice: Do not try to clear frost or other material from the inside of the front windshield and rear window with a razor blade or anything else that is sharp. This may damage the rear window defogger grid and affect your radio's ability to pick up stations clearly. The repairs wouldn't be covered by your warranty. Heated and Ventilated Seats: Press to heat or ventilate the seat. See Heated and Ventilated Seats on page 1-7. 3-27