1999 Pontiac Montana Owner's Manual - Page 205

yellowblue Rear Window Defogger Press the REAR button (the light will glow) to warm the defogger grid on the rear window and to turn on the heated outside rearview mirrors. NOTICE: Don't use a razor blade or something else sharp on the inside of the rear window. If you do, you could cut or damage the warming grid, and the repairs wouldn't be covered by your warranty. Rear Climate Control (Option) If you have the optional rear climate control, the rear seat passengers can control the temperature and the amount of air directed to the rear of the vehicle. The amount of air directed to the rear of the vehicle can also be adjusted using the front control for the rear fan. Set the main climate control mode knob to LOWER, DEFOG or DEFROST, when outside temperatures are cold or moderate, to send air to the rear of the vehicle through the lower vents. Set the main climate control mode knob to UPPER or BI-LEVEL to send air to the rear of the vehicle through the headliner outlets. To send conditioned air to the rear of the vehicle, press the A/C button (the light will glow) on the main climate controls. If you do not select A/C, air directed to the rear of the vehicle will be cabin temperature. The system will turn off automatically after about 10 minutes of use. If you turn it on again, the defogger will operate for about five minutes. You can also turn the defogger off by turning off the ignition or by pressing the button again. Do not attach a temporary vehicle license across the defogger grid on the rear window. 3-5