Air Delivery: Panel
WARNING: This page is about a different car, the 2004 Chevrolet Corvette. However, it is still accessible from the selected car via links, so may be relevant.
When the driver selects the panel mode, air is delivered through the instrument panel outlets and a small amount is delivered to the floor. The HVAC control module grounds the lower mode valve solenoid control and defrost mode valve solenoid control circuit. When the solenoids are grounded, vacuum is applied to the mode actuator through the Brown vacuum line, and to the defrost actuator through the Red vacuum line. The mode actuator will retract, opening the panel door. The defroster actuator will retract, closing the defroster door and open the heater door through mechanical linkage.