a buzzing sound that sounds like ZZZZzzzzzzeeee started again i can really hear it though the left passenger area speaker when the volume is low, can still hear it with the radio off just a little lower, got out of the truck popped the hood and revved the engine using the throttle and couldn't hear anything under the hood, i can only hear it inside the cabin, but someone said they could hear it last week when i was pulling into the driveway....maybe its coming from underneath not sure, any input would be helpful thanks Dan