Recirculation Operation
WARNING: This page is about a different car, the 2003 Pontiac Aztek and 2003 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 Vent or Bi-level. The operator must activate the blower for Recirculation operation. When the recirculation actuator sees an open in the control circuit, the actuator will default to the recirculation position.