wind noise:
 

have a 2008 V70, 3.2l with 65,000 miles.

I have a wind noise problem. I hear it slightly inside the cabin. If I roll the passenger window down or open the sunroof and drive 25-35 mph i can hear a whistle. Door seals look good, window seals seem good as does the windshield screen. I am wondering if there are any obvious places for me look or inspect for a air leak. Any insight would be appreciated.

Let me get this straight... when you roll down a window or open the sunroof, you hear wind noise?

Correct. But its not the same sound I hear when I roll the other windows down. Its more of a whistle. I can hear it with all of the windows up, too, just not as loud. It sounds like a high pitched whistle, not wind as you might expect to hear with an open window.

Does the noise go away at higher speeds?

Has the windshield been replaced recently?

Does turning the interior fan on/off make any difference?

From 0-20 there is no noise. 21-40 it whistles. Above 40 no whistle.

Windshield...I cant say for sure. I just bought the car a wee ago. I inspected it and seems to be very snug.

inside fan speed does not affect the whistle.

Where else can I look, door handle or wheel well? What is a good method for isolating such a sound or is this a guessing game?

Could it be coming from the motor?

The motor? Maybe, but I only hear it if i am moving. If I am neutral and rev the engine, no noises. I am fairly sure it is a gap in a seal. But i have inspected the obvious ones. I was hoping others had come across a similar noise with a solution.

Located it. It is a crack on the lens on the passenger side rear-view mirror. I ordered a new one...any idea how I can open that mirror up?

Glad you found the problem, but what's a mirror lens? You mean the mirror glass? And how do you know that's it?

the plastic turn signal bulb lens. If I cover it the whistle stops. I siliconed it and its fine. But, that is a temporary fix. I'd like to replace the lens.