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I have a similar noise and it has been there since my 2005 Sienna was about 2 years old. It is NOT affected by whether the blower motor is on or off. It is also coming from the centerline of the car and sound like it is coming from somwhere below that center black speaker grill on top of dash, or either forward of that where window glass ends. It only starts when I get to about 45-50mph and continues at any speed above that. It is more of a grinding type sound that sounds just like a dry or faulty speedometer cable from old school cars! Any ideas?