Originally Posted by Franck from Moscow

Hi,

If the problem copmes from the ventilation fan in the cabine, then i suggest u to chane the following detail.

u can find pics about the part that is dead on your car here.

BMW [6enligne.net] Les Fiches Techniques de 6enligne

The part number is 64116923204 (for a E46).

The post is in french but the diagnostic of the symptoms is the same than yours (and mine also).
If any problem with translation, just contact me, i am French.