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This may be the reason for your problem
Posted by Allan (more from Allan) on Tue, 25 Mar 2003 11:35:44
In Reply to: load rack noise & rear seat light (9-5 wagon), Douglas, Tue, 25 Mar 2003 09:05:46
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Often, the cross bars have an airfoil type cross sectional profile. That is a rounded leading edge, trailing to the rear. Years back, a number of GM customers complained of excess wind noise from racks installed with crossbars backwards -that is, with the sharp edge forward. They were a dealer installed option, and I suppose a lot of the installers figured the sharper edge would cut through the air easier.
It doesn't.
Instead it works like a reed to make noise, and results in a lot of vortex action coming off the rear facing rounded edge, producing drag, and noise. So, you might look to see which way the cross bars on your roof rack are oriented.
posted by 192.85....
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