The seal is bad up there between the plastic top and the roof of the van.
This happend to me while going across the Varazano bridge in NYC with some strong cross winds...all of a sudden this horrible very scary very loud buzzing sound  from above my head...scared the crap out of me.
well I pulled over to check what it was and then with a bit of black duct tape across the edge of the luggage rack and the windshield rubber seal I was good to go for let see at this point another 6 years!
Brady

----- Original Message ----
From: Doug Noganav <vanagon@ASTOUND.NET>
To: vanagon@GERRY.VANAGON.COM
Sent: Sat, February 6, 2010 3:38:54 PM
Subject: Re: Buzzing luggage rack on westy need advice

Nothing up there but the factory westy top.
its the luggage rack that is buzzing right above the windshield.

----- Original Message -----
From: "Matthew Thyer" <matt_thyer@hotmail.com>
To: <vanagon@astound.net>; <vanagon@gerry.vanagon.com>
Sent: Saturday, February 06, 2010 12:12 PM
Subject: RE: Buzzing luggage rack on westy need advice

The air deflection plates you can buy for most of them help.  Also make sure
its not a bar end wistle that's causing harmonics in the roof (sounds like a
buzz to me).  End caps on round bars make the difference there.

--
Matt Thyer

----------------------------------------
> Date: Sat, 6 Feb 2010 12:02:04 -0800
> From: vanagon@ASTOUND.NET
> Subject: Buzzing luggage rack on westy need advice
> To: vanagon@GERRY.VANAGON.COM
>
> Anybody know a surefire way to keep the luggage rack from "buzzing"?
=