Since new I have had a random juggling sound coming from the passengers air vent. sounds like golf ***** rattling around in a box. Its speed dependent on the fan speed and its random.

Car was in for service today and found nothing. I will have to video it for them now. Anyone else with funny rattles from the fan system?

BTW The loaner C200d was great. The car was quite, comfortable, had nice steering and the satnav (Garmin) was far better than MB's attempt.