Flapping Noise in dashboard

[afink@q.com]

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For past 1,300 miles I've experienced a very annoying, intermittent rattling or flapping noise behind the radio/heating consol or dashboard of my 2000 Boxster with 78K on it. It begins above 60 mph, occurs on smooth and rough roads, comes and goes, cannot be induced nor stopped. Sounds like a fan blade out of alignment or some plastic component vibrating against something else. It's at times loud and rising, at other times quietish.Then it stops completely. I've checked all Porsche and proprietary manuals for likely suspects in the area and cannot locate a likely culprit. I've banged, poked, tightened, and fiddled with stuff in the forward area and in the cab. All to no avail. Turned on/off and up/down on every conceivable control. Who's got the magic answer out there?

Fink

Denver

[1schoir]

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For past 1,300 miles I've experienced a very annoying, intermittent rattling or flapping noise behind the radio/heating consol or dashboard of my 2000 Boxster with 78K on it. It begins above 60 mph, occurs on smooth and rough roads, comes and goes, cannot be induced nor stopped. Sounds like a fan blade out of alignment or some plastic component vibrating against something else. It's at times loud and rising, at other times quietish.Then it stops completely. I've checked all Porsche and proprietary manuals for likely suspects in the area and cannot locate a likely culprit. I've banged, poked, tightened, and fiddled with stuff in the forward area and in the cab. All to no avail. Turned on/off and up/down on every conceivable control. Who's got the magic answer out there?

Fink

Denver

Is it possible that it's related to your heater blower? It has a "squirrel cage" driven by an electric motor and could case the kind of flapping or rattling noise if something temporarily comes into contact with the blades or if the bearing on the motor or on the cage is worn.

Regards, Maurice.

[cueball47]

At last, someone with the same problem as me! When I hit about 70MPH I get a flapping noise from somewhere in front of the driver side dashboard. It's as if there is an air deflector door of some sort that is loose. Does anyone know if there are speed sensitive air deflectors that can malfunction? This noise magically disappears when I crank Guns n' Roses on the stereo.

I don't think it's heater/AC related because the noise is independent of the fan speed and floor/dash/defrost selection. And it's not an undercarriage thing either. I thoroughly inspect the wheel wells, under carriage, everything the eye can see... Nothing!

Any hints?

[RFM]

The intake air flap under the AC air filter is speed related, take a look if something is going on there, loose connection etc.