FSETH and others that apply I guess... If there is a slight vibration to be felt with a fan speed dependant humming noise then my guess would be the squirrel cage on the blower fan is getting slightly out of balance. Quite possibly from slight/uneven dust buildup or usually a leaf falls down in there when the ac microfilters are changed, which can also get past the blower cage against the outer casing and cause the fluttering sound some hear as the blower fan rubs against it. When it comes to perceptive problems like this, details are key! As a tech at the dealer I can't tell you how many times I have to get the service adviser to call the customer back and all but grill them for more details on certain circumstances needed to duplicate the complaint. I don't want to "could not verify" because BMWNA does not pay me unless work is done, and not "adjustments" either, I have to change a part to get paid under warranty. If you give them all the details needed, that already narrows it down to the point that they can pretty much just change your blower motor, which means r&i the dash to open the hvac box. But if you just say "the air sounds different" (yes, I've had that one) then we have nothing to go on! So god luck and good speed!

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RIP 4.6is.....

2003 4.6is