My 2008 chrysler 300 is whistling all the time u cant hear it from inside the car but but from the outside u cant here a whistling sound
I had same problem with my car, I'm assuming you are driving when you hear whistling? Check front windshield seal by slightly pushing on windshield all around seal and see if whistling changes sound!! This was my problem and it was a brand new car!!!
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#3David Mitchell Sr.Reputation840