Humming when the heat is on...

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Jan 2, 2012 | 11:14 AM

bb bmw

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Joined: Feb 2009

Posts: 44

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From: Milwaukee, WI

My Ride: 06' 530xi

All,

When I'm driving I hear a low hum when the heat is on...when I turn the heat off the hum goes away.

What could this be?

Jan 5, 2012 | 09:28 AM

aarnoldupenn

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Joined: Jan 2011

Posts: 15

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From: Lancaster, PA

My Ride: 05 525i

I hear this too, does it with AC also, so I'm guessing its a fan that blows air.

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