Join Date: Jan 2007
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The external temperature sensor is located in bottom of one of the wing mirrors. Put your hand underneath and on one of them there is a small bump - thats the sensor. To change it you will need to take out the mirror glass I think.
Thinking about it Im not sure about your second question, it could well be linked in to the climate control, but not 100% on that. Im sure someone else will be able to answer your second question more thoroughly soon.
Currently in dave_mezza2006's garage:
2014 Vauxhall Astra Limited Edition 1.4 16v VVT Turbo