Air Temperature Actuator

The vehicle operator can determine the level of A/C by turning the temperature control, located on the HVAC control module, to any setting. The temperature switch can change the vehicle's air temperature regardless of the HVAC mode setting, heater or A/C. The left IP junction block provides power to the left air temperature actuator through the ignition 3 voltage circuit. Power and ground are provided to the HVAC control module by the ignition 3 voltage and ground circuits.

When a desired temperature setting is selected, a variable resistor is used to determine the signals value of the air temperature door control. For vehicles with the dual zone option (RPO CJ3), the signals value refers only to the left air temperature door control. 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 left 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.

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