SOURCE: VW temperature display
The sensor for the temp display in located in front of the radiator under the hood, it is round and has 2 wires going to it, plug and unplug it a few times and recheck to see if the display works, if not replace the sensor.
SOURCE: Replacement Outdoor Temperature Sensor for Atomic Clock
Search the manufacturers website and ebay. It may require a little time and effort.
Double check the batteries to make sure they are installed correctly. If one of the batteries in the outdoor sending unit is in backwards, it will not send the outdoor data. On the indoor unit, there is typically one battery that is used for receiving the signal from the outdoor unit. If all of the batteries are in correctly but that one, you will see the display and the indoor temperature information, but the outdoor information will not be displayed.
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