Mix-Blend Mode

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

When the operator selects Mix-Blend, the following occurs:

The A/C Bi-level mode actuator has vacuum applied to it through the Brown vacuum line, pushing the vent door closed.
Vacuum is bled off the heater/defroster actuator, holding the defrost door stationary in the half-open position.
The heater door is also held stationary in the half-open position through mechanical linkage.
A/C is forced ON.