Technical name, It's a ambient temperature sensor. The sensor is in front of the A/C condenser near the upper passenger side corner, just behind the grill.
Almost impossible to see until the grill is removed and it's easy to replace. Just grab the grill and pull forward and the sensor is black rectangular device about 1/2"X1/4" as I recall. Electrical plug on short pigtail. Easy on to do on a cool day.