Quote Originally Posted by jeangreyfan View Post
I have tried and tried to figure out what this is and I cannot. Hopefully someone on here will be able to help me. I have a 2007 Base model Grand Prix with 58,xxx on the clock. When I am driving on the highway I get a loud howling noise (like when I run over the lines on the road that are supposed to wake you up as if you are about to run off the road or if you are blowing air across the top of a coke bottle) that sounds like it is coming from the firewall of the car. It starts around 60 mph and grows louder/more constant when I accelerate to 80 mph. I've not had the car more than 80 yet. It does it when I have the windows and the sunroof all closed/rolled up but when I click the sunroof to open it stops. It's not the AC vents being sort of closed. Any suggestions would be great!
Sounds like the sunroof seal. My bonnie's sunroof didn't pull all the way up, was close but not quite all the way and it did this. My GUESS would be to start with the sunroof seal.