sstreime

I have the same issue and am thinking it is the mirror housing that is whistling but am not sure. Trying to open and reclose the window does not seem to fix the issue.

911Enthusiast

So after 2 visits to the dealer including re-fitting door panel the problem persists. At least now instead of denying the problem, they seem to be making an effort to find and fix the root cause.

CDH911C2S

On a BMW I owned I had the same issue.

It ended up being a missing jack pad ---check if all jack pads are place.

Cheers

mtony

Deleted

mtony

Happens commonly with BMWs that have the hard plastic jack pads missing, but I don't think the 991s have those.

Pmorritt

Back in 1993 I bought a Mazda RX3R. Wow what a car. I had a whistling that sounded like a bee. It was the first year of that model and dealer was great to find entry of wind. It took a while but it was the seal around the windshield. Try this. Tape the window, windshield all around. Drive it a bit see it if the noise is gone. Now, start removing a section at a time. Drive it. When you have the noise again, you have identified the area that needs to be fixed. Voila!

kfz03110

My 991S has wind whistling too. Yes it's the mirror with clear film on it! I taped the mirror roughly with a scotch tape, the whistling went away! I will call my clear film installer to reinstall the mirror part with a different cut film. Thanks a lot to Polusky!

Speed2000

If the film hangs over the edge between the painted part and the black plastic part, it will whistle.

vodkag

Wow i am having the same issue after xpel on mirror. Gotta try the fix

thanks!

Bulldawgfan1000

I am having the same whistle above 70mph on driver side. The pitch of the noise changes when the inside of rear quarter window is pressed outwards, leading me to believe it is a rear quarter window issue. No PPF is installed on my carrera. Jim Ellis Perimeter tech located the issue and said he would fix it, but a few days later the service advisor called back and said it was normal. I was not happy, considering the car is under warranty and the whistle is quite annoying. Planning to try Hennessy soon, hoping they will fix and also not cause any other rattles if they have to remove trim/ window to re seal it.

Dewinator

Does it still do it if you pause on position 1 for a second before turning the ignition on when you start the car?

Bulldawgfan1000

Yes I have tried that, I also tried resetting the window position sensors following the steps but with no luck. The service advisor said: “these are not quiet cars” which I would agree accept he knows as well as I do that this is not normal for all other 911 coupes. If they are unable to fix I am planning on trying the black mill wind deflectors that help with buffeting with Windows down, but I am thinking maybe they would change the air flow enough to also fix the whistling. I love the car either way though, I just turn up the radio or let down the windows slightly and enjoy the smoothness of the suspension and the power band of these turbo charged 3.0L flat sixes. I came from a 987.1 Cayman which was cool for its own reasons but this 911 is a huge step up for sure!

grendelrt

I have deflectors and have been working through this issue as well. I tried tape on my side view mirror, resetting the window, and taping the deflector to no avail so far.

Bulldawgfan1000

The aftermarket wind deflectors did not help? I will update the forum when I am able to take it back to the dealer. This seems to be a common issue Because the rear quarter window is not held in as tightly as you would think according to others here that have taken it out.

DanQ

I didn't see this mentioned before in this old thread, but the old school way to check for window seal leaks is to close a dollar bill between the glass and the seal. If you can easily pull the bill out with the door closed you need a new weatherstrip or the door glass adjusted. If the bill is trapped and hard to pull out the wind can't get in to make noise. Slide it over the length of the weatherstrip.