Sunload Sensor
WARNING: This page is about a different car, the 2002 Lincoln Blackwood. However, it is still accessible from the selected car via links, so may be relevant.
The A/C sunload sensor is located on top of instrument panel. It contains a photovoltaic diode that is sensitive to light. It has some unspecified resistance across terminals depending upon amount of light reaching photovoltaic diode; therefore only test that can be performed is for an internal short circuit.