2000 Chevrolet Prizm Owner's Manual - Page 132

Do not attach anything like a temporary vehicle license or a decal across the defogger grid on the rear window. 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. Your vehicle's flow-through 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 and the air intake lever is at CIRCULATE. Ventilation System For mild outside temperatures, when very little heating is required, you can still direct outside air through your vehicle. Move the air intake lever to CIRCULATE and turn the airflow knob to VENT. Turn the temperature knob to a comfortable setting and the fan knob toward HI. Airflow through the side vents is normal in all airflow modes. To optimize the effectiveness of your system in FLOOR, DEFOG, or DEFROST modes, turn the outboard vent (shut-off) thumbwheels down to the closed position. Adjust the direction of airflow by moving the louvered vents. 3-5