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That will be for the climate contol. It monitors the air / humitdy for the climate control system.
The fans are known to get dirty / bunged up with fluff. Maybe you can clean it, failing that you could replace the fan with one from a breakers yard.
Currently in dave_mezza2006's garage:
2014 Vauxhall Astra Limited Edition 1.4 16v VVT Turbo