I have a E39 520i from 1996 and after Auto Registry did a check to the car when first time registered in Romania, they reseted somehow the displaying of temperature from celsius to fahrenheit ! I've becamed habituated with fahrenheit too but it would be nice to have it back in celsius ! Can you please tell me how to do that ?
oh... I've forgot to tell that in user manual is not saying that and also I've Emailed BMW but they refuse to provide answers ! Local service located at 60km far from me is not knowing also... They have only mechanics in that service !

try the owners manual im sure it will be in there or even try to google it! good luck