External Temperature Display
WARNING: This page is about a different car, the 2009 Mercury Grand Marquis and 2009 Ford Crown Victoria. However, it is still accessible from the selected car via links, so may be relevant.
When the ignition is first turned ON, the external temperature displayed will be the last temperature read before the ignition was turned OFF. If the last temperature read is below 2°C (35°F), the HVAC module will prevent A/C operation.
The external temperature display will update when the vehicle has been driven above 40 km/h (25 mph) for greater than 30 seconds. Once the HVAC module updates the external temperature, the HVAC module will allow normal A/C operation.