1993 Pontiac Grand Prix Owner's Manual - Page 120

NOTEE Don't usea razor blade or something elsesharp on the inside of the rear window. If you do, yo could cut or damage warmi the grid, andthe repairs would I Flow-Through Ventilation System Your Pontiac's flow-through ventilation system supplies outside air into the vehicle when itis moving. Outside air will also enter the vehicle when the heater or the air conditioning fan is running. I Ventilation Tips Keep the hood and front air inlet free of ice, snow, or any other obstruction (such as leaves). The heater and defroster will work €arbetter, reducing the chance of fogging the inside of your windows.. When you enter a vehicle in cold weather, set the blower fan to the highest setting for a few moments b e h e driving off, This helps clear the intake ductsof snow and moisture, and reduces the chance of fogging the inside of your windows. * Keep the air path underthe front seats clear of objects. This helps air to circulate throughout your vehicle.