1998 Pontiac Grand Prix Owner's Manual - Page 168
1998 Pontiac Grand Prix Manual
Page 168 highlights
Ventilation Tips 0 Rear Window Defogger Keep the hood and front inlet free of ice, snow or air any other obstruction, such as leaves. heater and The defroster will work far better, reducing the chance of fogging the inside your windows. of When you enter a vehicle in cold weather, adjust the mode knob to FLOOR and the fan to the highest speed for a few seconds before driving This off. helps clear the intake ductsof snow and moisture and reduces the chance of fogging inside of the your windows. Keep the air path under front seats clear the of objects. This helps air to circulate throughout your vehicle. 0 0 Your comfort control system has a button to operate The your rear window defogger. electronic comfort control system has a button marked REAR. The system with automatic temperature control has a button marked R.DEF.