Recirculation Mode

WARNING: This page is about a different car, the 2002 Cadillac Eldorado. However, it is still accessible from the selected car via links, so may be relevant.

When the recirculation mode is requested, whether manual or automatic, a solenoid inside the vacuum control assembly connects the recirculation actuator to the vacuum source. Power is provided to the recirculation solenoid by the vacuum control assembly supply voltage circuit. Ground is provided internally within the HVAC control processor. When the solenoid is grounded, vacuum is supplied to the recirculation actuator. The recirculation actuator retracts, closing the recirculation door. This draws air from inside the vehicle instead of fresh air from the outside.

The recirculation mode can be used in both manual and automatic operation. Recirculation is only allowed in the following modes:

VENT
FLOOR
BI-LEVEL

The RECIRC LED will flash to alert the driver that recirculation mode is not available. When in automatic mode, recirculation will stay on until either the vehicle operator selects ambient air or the automatic system has cooled the vehicle sufficiently. The recirculation function will operate for the entire ignition cycle. Pressing the recirculation switch with the system off, will return the system to the last setting prior to the system being turned off.