Has anyone else experienced problems with the ambient air temperature sensor/aspirator above the drivers' seat in the headliner? Until two weeks ago, I thought this was the microphone for OnStar but it began making a resonating sound similar to a fan with bearings about to expire. The dealership is investigating it today and will probably replace the module. I did a quick search but found nothing. (It is difficult to search for something like this, since there are several threads concerning cabin noises and not many people know what the part is.) I am wondering if anyone else has experienced this problem? It is not a big issue. After working with computers for many years, I quickly learned that fans will just die after awhile and usually quite noisily. I am just wondering if I am alone with this issue.