General

The two manual climate control assemblies are:
1. Heater Controller - C42 Systems
2. Heater and A/C Controller - C60 Systems

The control assemblies contain the following controls:
^ A rotary knob to control blower speed
^ A rotary knob to control the air temperature
^ A rotary knob to select the desired operating mode
^ One push button, depending on option content, that controls the Rear Defogger (C49)

The controls are lit when the parking lamps or headlamps are ON. The instrument panel lighting circuit provides voltage. The control assembly lamps are in parallel with the following components:
^ The instrument cluster bulbs
^ The radio dial bulb
^ Other interior illumination bulbs

The dimmer control of the headlamp switch controls the brightness of the control assembly lamps.

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

Application and ID