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Mine does the same too,although i didn't when i got the car,I took it in to the dealer just before i put it away for the winter.They said they found a problem,when i got the car back it was still the same,they said they all do it.My problem is if they said they found a problem,and then when i got back it was the same.I hate the dealer,so full of **** sometimes.Anyway i know they are not all like that,my friends 08gt500 and my friends 06 gt do not make that sound!I know all cars when you put it on floor only,it will blow slight on defrost to keep the windshield from foging up! the noise can drive me nuts sometimes!