Dual Zone

WARNING: This page is about a different car, the 2002 Pontiac Montana, 2002 Oldsmobile Silhouette, and 2002 Chevrolet Venture. However, it is still accessible from the selected car via links, so may be relevant.

Vehicles with the dual zone option (RPO CJ3) will have an additional air temperature actuator. The HVAC control module will have dual sliding temperature switches instead of the rotary temperature switch. The fuse block provides power to the right air temperature actuator through the ignition 3 voltage circuit. When a desired temperature setting is selected, a signal is sent from the HVAC control module to the right air temperature actuator through the auxiliary air temperature door control circuit. When the logic receives the signal, the right air temperature actuator moves the temperature door to a position to divert sufficient air past the heater core or evaporator to achieve the desired vehicle temperature. Ground is provided by the ground circuit.

The dual zone controls allows for maximum temperature offset between the driver and passenger. It is possible to select maximum airflow over the evaporator core with one dual zone switch along with maximum airflow over the heater core with the other dual zone switch. Each air temperature actuator is independent from the other and the passenger side is not limited in its range of temperature offset.