1998 GMC Envoy Owner's Manual - Page 139

Ventilation Tips 0 Keep the hood and front air inlet free of ice, snow or any other obstruction (such as leaves). The heater and defroster will work far better, reducing the chance of fogging the inside of your windows. fan control to the right to the highest setting for a few moments before driving off. This helps clearthe intake ducts of snow and moisture, and reduces the chance of fogging the inside of your windows. e When you enter a vehicle in cold weather, move the 0 Keep the air path under the front seats clear of objects. Thishelps air to circulate throughout your vehicle. You will find air outlets in the center and on the sides of your instrument panel. Defogging and Defrosting On cool, humid days, use BLEND to keepthe windshield and side windows clear. Use DEFROST to remove fog or ice fromthe windshield quickly in extreme humid or cold conditions. Turn the temperature knob to the right and move the fan control to the right. You can direct the airflow side-to-side by rotating the thumbwheel located in the center of the vent. The vent can be tilted up and down also. To control the amount of airflow through the outlets, rotate the thumbwheel below the vent. 3-6