Town Car V8-4.6L (2008)
Outside Temperature Display: Description and Operation
EXTERNAL TEMPERATURE DISPLAY
The external temperature is displayed when the EXT button is pressed. While the actual external temperature can vary continuously, the value that is
displayed will update at a specific rate depending on whether or not the engine is "hot" and whether or not the vehicle is moving.
When the external temperature is rising, the display will update slowly. Updates (when the actual external temperature is higher than currently displayed
value) will be limited to 0.6°C (1°F) every 20 seconds while the vehicle is moving at 40 km/h (25 mph) or greater for more than 90 seconds, or 0.6°C
(1°F) every 20 minutes if the vehicle is not moving at this speed. This is to prevent the heat from the engine compartment from affecting the accuracy of
the display.
When the external temperature is dropping, the display will update quickly.
Updates (when the actual external temperature is lower than currently displayed value) will only be limited to 0.6°C (1°F) every 2 seconds (regardless of
vehicle speed). Consequently, the display will essentially follow the drop experienced by the external temperature thermistor.
