Front Temperature Controls

The temperature valve actuator operates in response to a voltage signal from the heater and A/C controller's temperature control knob. When the ignition switch is in the RUN position, operating voltage is available to the temperature valve actuator motor from HTR-A/C fuse 12 through CKT 141 (BRN). The motor grounds to ground G201 through CKT 150 (BLK). The motor positions the air temperature valve in a position consistent with the voltage signal from the heater and A/C controller. The actuator motor receives the signal in CKT 733 (LT BLU).

The heater and A/C controller also receives power from the HTR-A/C fuse 12 through CKT 141 (BRN). The heater and A/C controller also grounds through CKT 150 (BLK) to ground G201. In the controller, current flows to ground through a rheostat. The temperature control moves the wiper arm of the rheostat in order to select a portion of the voltage dropped across the resistance. The actuator motor receives the voltage in order to position the valve.