1994 Chevrolet Blazer Owner's Manual - Page 136

Comfort Controls Flow-Through Ventilation System Your vehicle's flow-through ventilation system supplies outside air to the inside of your vehicle when it is moving. With the side windows closed, air will flow intothe front air inlet grilles, through the vehicle, and out the rear air exhaust valve. Outside air will also enter the vehicle when theheater or the air conditioning fan is running. 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 far better, reducing thechance of fogging the inside of your windows. When you enter a vehicle in cold weather, turn the blower fan to HI for a few moments before driving off. This helps clear the intake ducts of snow and moisture, and reduces thechance of fogging the inside of your windows. Keep the air path under the front seats clear of objects. This helps air to circulate throughout your vehicle. 3-2