You issue does not appear to be related to the SIB I posted, which replaces the instrument cluster. It is probably as you mentioned, a faulty climate control module, since that is the only unit affected.

There is a clear disclaimer on the BMW TIS site that the SIBs are only effective for NA vehicles. So therefore, I cannot say if the same bulletin exists in Europe.

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2014 Mazda 3 GT: Ø Consumption: (click for details)