2006-2008 VW - Ambient Temperature Sensor Reset
Ambient Temperature Sensor Reset
Applies to 2006-2008 Beetle, Jetta, GTI, Rabbit, EOS, and Passat
If the ambient temperature sensor or A/C control head has been unplugged or replaced for any reason, the ambient temperature sensor must be reset in order to function properly.
To reset the sensor, test drive the vehicle. It's that simple; driving the vehicle at speeds of over 25 mph will reset the sensor. If you can't do the test drive, let the car idle for 20 minutes and that'll reset the sensor too.
But for chrissake, DO THE TEST DRIVE!