Mix-Blend Mode
WARNING: This page is about a different car, the 2002 Pontiac Firebird and 2002 Chevrolet Camaro. However, it is still accessible from the selected car via links, so may be relevant.
When MIX-BLEND is selected, air is delivered to the windshield outlets and the floor outlets. Vacuum is applied to the mode actuator through the Green vacuum line, and to the defrost actuator through the Yellow and the Red vacuum lines. The mode actuator will retract, closing the vent door. Applying vacuum to both sides of the defroster actuator will hold the defroster door stationary in the half open position. The heater door will also be held stationary in the half open position through mechanical linkage.