i randomly have a tapping sound down there.. like 2 weeks ago it turned into a sound like an alien squealing in a movie when my AC was on.. then while driving w/ the heater(and AC) on over the weekend i got this sound that sounded like... BVBATTTTRRRRTTTTTAAAAAAAAAAAAAZIING.. then the sound of something whizzing through the air for a second.. then everything was quiet and back to normal... im guessing it was somethin stuck in my AC