1995 GMC Sonoma Owner's Manual - Page 118

Ventilation System Your vehicle's ventilation system supplies outside air tothe inside of your vehicle when it is moving. With the side windows closed, air will flow into the front air inlet grilles,through the vehicle, and out the rear air exhaust valve. Outside air will also enter the vehicle when the heater or the air conditioning fanis running. Ventilation Tips e Keep thehood and front air inlet free of ice, snow, or any other obstruction (such as leaves). The heaterand defroster will work far better, reducing the chance of fogging the inside of your windows. e 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 the chance of fogging the inside of your windows. e Keep the air path under the front seats clear of objects. This helps air to circulate throughout your vehicle. You will find air vents in the center and on the sides of your instrument panel. 3-4