Defrost Switch
WARNING: This page is about a different car, the 2001 Isuzu VehiCROSS. However, it is still accessible from the selected car via links, so may be relevant.
Depressing defrost switch will position mode door to direct airflow to defrost outlet vents and a small amount of air to side window demister vents. During defrost operation, air intake door will default to outside (fresh) air source. Depressing recirculation switch will override defrost default setting and air will be recirculated during defrost operation.