Dual Zone

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 left IP junction block provides power to the right air temperature actuator through the ignition 3 voltage circuit.

When a desired offset temperature setting is selected, a variable resistor is used to determine the right air temperature door control signals value. A resistor inside the HVAC control module provides a varying ground. This changes the 12-volt signal coming into the actuator and varies the voltage so the actuator is moved into the proper position. The motor opens the right air temperature actuator 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 switch 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 the range of temperature offset.

For a description of the RPO Code(s) shown in this article/images refer to the RPO Code List found at Vehicle/Application ID RPO Codes