BI-LEV Mode

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2002 GMC Savana Special, 2002 GMC Savana Camper Special, 2002 GMC Savana, 2002 Chevrolet RV Cutaway, and 2002 Chevrolet Cutaway. However, it is still accessible from the selected car via links, so may be relevant.

When the operator selects BI-LEVEL, the following occurs:

The mode actuator is in neutral position.
The defrost actuator has vacuum applied to it through the yellow vacuum line.
The defrost actuator closes the defrost door, thus opening the heater door though mechanical linkage.
Vacuum is bled off the mode actuator and the vent door is held stationary in the half open position.