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Have a air noise,( sounds like high winds around window) about 45mph up gets louder, at 80 you have to turn the radio up. Have had it to the dealer 4 times. My last trip I duct taped every spot around door and window, mirror, top of hood thinking I could figure this out, NO LUCK. Any body else??
 

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I like to use a length of vacuum tubing to isolate noises like yours. One end in your ear and then move the other end around the cab until you identify the source. You can simply tape the other end of the tube at the point you are testing or have someone in the cab with you to move the tubing around to various test points. The front doors are prone to sagging which causes wind noise near the tops of the doors.
 
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