Weird howling noise under dash?

[hjz8785]

Ok so i have a 2006 Grand Prix GT(supercharged 3.8L). At about 55-75 MPH there is a weird howling/whistling sound coming from under the dash and I cant figure out what it is. It changes pitch with more wind and speed so it must be a leak, right? Anyone know what this is or has anyone had experence with this. An feedback will be greatly appreciated, thanks guys!

[jeangreyfan]

Have you figured out what was causing this? My 2007 Base does it when all the windows and sunroof are closed but stops when I open the sunroof to the first click. Starts around 60mph and goes to 80mph...it's really annoying and the radio doesn't cover the noise...

[Blown 346]

My 07 GT does the same thing. My wife and I just bought the car and just noticed the noise yesterday. I am too tryijng to figure out what theis is caused by.

[jeangreyfan]

blown...as soon as i know i will post it here...i have a thread going that is asking the question so hopefully it will get solved...

[98gtp]

Is the heater controller (modes change) working correctly if not it could be a vacuume leak.

[jeangreyfan]

98gtp...i havent checked the heater controller since its 100 degrees or more out here...will check it later...

[jeangreyfan]

98gtp...all the modes change and the temp changes when i change them...any other suggestions?

[Scottydoggs]

hows your weather stripping around the doors?, bottom and sides? that would cause some noise.

[jeangreyfan]

scotty...the weather stripping looks fine all the way around...but I will check it again...i thought it might have been from the flappy stripping that was where the door closed next to the hood but it like that on both sides and doesn't seem to be where the problem is...will let you know as soon as i check the stripping...

*****UPDATE*****
I checked the weather stripping all the way around the car and on the windows and the sunroof...but when i looked at the sunroof, it seemed to be above the car just ever so slightly...i am going to try and mess with it tomorrow and see if it can be adjusted just a bit and see if that fixes it...

[Blown 346]

I did some research and if the noise seems like its coming from the center of the dash, its not the weather stripping or moon roof. It could be the plastic cowling along the windshiled at the wipers. Mine isnt flush against the windshiled anymore and has a bow effect. Im going to tape that down flush against the windshiled and see if the noise stops. Will keep you posted.

[jeangreyfan]

update again...
it is NOT the sunroof...i adjusted it to where the sunroof was more flush with the top of the car and it still howled...i tried taping down the cowl on the windshield and it still howled...i also tried the wipers to see if it eliminated it at all and no dice...