2004 Cadillac CTS-V Owner's Manual - Page 151

Sensors There is also an interior temperature sensor located to the right of the steering wheel on the instrument panel. There is a solar sensor located on the instrument panel, near the windshield. These sensors monitor the solar radiation and the air inside your vehicle, then use the information to maintain the selected temperature by initiating needed adjustments to the temperature, the fan speed and the air delivery system. The system may also supply cooler air to the side of the vehicle facing the sun. The recirculation mode will also be activated, as necessary. Do not cover the sensors or the automatic climate control system will not work properly. 3-29