For 1990-2009 cars

The dual zone (CJ2) system utilizes 1 actuator for the passenger side and 1 for the driver's side.

The single zone (C68) A/C system utilizes 1 air mix valve actuator. This actuator adjusts the temperature for the entire vehicle.

The air mix valve actuators control the outlet air temperature commanded by the heater and A/C programmer.

A reversible DC motor in the actuators operates the air mix valves. The valves determine how much air passes through the heater core for each side of the vehicle. Refer to the following list:

• | When maximum cooling is required, the motors move the valves and block the air flow through the heater core.

| No heating of the system air occurs.

• | When maximum heating is required, the motors move the valves and force all of the air to flow through the heater core.

| Maximum heating of the system air occurs.

The driver air mix valve actuator is contained in the heater and A/C programmer. This actuator controls the temperature of the discharge air on the driver side by operating the driver air mix valve. The valve directs air through or around the heater core.

The passenger air mix valve actuator is mounted on the heater and A/C module assembly.

When not operating in dual zone mode, the 2 actuators will operate the mix valves in unison.

The air mix valve actuators contain feedback potentiometers. The feedback potentiometers inform the heater and A/C programmer of air mix valve positions.