Hi, I have a 2005 corolla and ever since I bought the car it has made a buzzing sound from the vents, or so it seems. I keep taking it to the dealership... and they keep telling me they can't find anything. I'm taking it back again today to fuss at them. They told me it was my windshield so they resealed it...but the noise continues.. does anyone else have this problem..!?!