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This is the place to get answers, opinions and everything you need related to your E46 (sedan, coupe, convertible and wagon) BMW!

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Old 09-26-2015, 12:57 PM   #1
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Join Date: Sep 2015
Location: Sweden
Posts: 29
My Ride: BMW 328 iM 1999 Lim
Front vent hissing noise annoyance

Selecting front facing vent or auto mode gives an annoying air noise as cold air is selected. Turn the temp mix knob to full warm and it quiets down. Why such a difference in noise? Anyone found a way to quiten the airstream?

Air noise is inversely related to duct area for a given air stream. Wonder if there is a restriction in air flow as the heat mix is turned upp on the wheel, or if it is channeled differently since the noise goes down in volume.

I've got a brand spanking new cabin air filter. So that is not the issue. A work around I use is selecting windscreen and foot wents engaged only.

The phenomena is present in the E39 too, although not as prudent.

Thanks for your inputs.
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