Recirculation Operation
WARNING: This page is about a different car, the 2004 Pontiac Aztek and 2004 Buick Rendezvous. However, it is still accessible from the selected car via links, so may be relevant.
The HVAC control module controls the air intake through the recirculation actuator. Recirculation is only available when the HVAC control module is in Panel or Bi-level. The recirculation mode will stay on and the recirculation indicator will illuminate until either outside air or a non-recirculation mode is selected. When the recirculation actuator sees an open in the control circuit, the actuator will default to the recirculation position.