i have a 98LT chevy,2 days ago i began to hear a strange screetching noise IN THE A/C switches AREA and the glove box area.. somehowe like a rotor or a plastic scratching ... hard to describe, it's like someone have diaria :S:S really .. cant find out what it is .. but it surely stop when i stop the engine, i've been told that it might be the air conditioning switches bcoz they the air openings opens by air push .. can it be an air leak ?? any help how ti fix it ?? it realy makes me angry :S