Recirculate Air Button
WARNING: This page is about a different car, the 1999 GMC Sierra and 1999 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
When the recirculate air button is pressed, air from inside the vehicle mixes with a small amount of outside air. The air discharges from the air conditioner, heater and defroster outlets.