C300, buzzing noise coming from vents - Mercedes-Benz Forum

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post #1 of 2 (permalink) Old 01-08-2010, 06:37 AM Thread Starter
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Date registered: Jan 2010
Vehicle: Mercedes C300
Location: Indianapolis, IN (USA)
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C300, buzzing noise coming from vents

Just noticed it this morning, it's a 2009 C300 sport (had it about 8 months).

Whenever I turn on the defrost or heat, there is a loud buzzing sound coming from the vents. The heat still works, but the buzzing sound is new. It goes away when I turn off the heat/defrost.

Could it be cold weather related, or something else?
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post #2 of 2 (permalink) Old 01-08-2010, 01:36 PM
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Does it should like the blower motor is rubbing against the side of the blower housing? If so, the bearing in the fan motor could have play in it and it is causing the fan to move around in the housing, and not in a good way.

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