Home › Forums › Stay Dirty Lounge › Service and Repair Questions Answered Here › 2012 Navigator – Strangest sounds I ever heard – Siren › 2012 Navigator – Strangest sounds I ever heard – Siren January 23, 2020 at 10:34 pm #895890 Richard KirshyParticipant Inspect your drive belts, tensions and pulleys. If needed remove one belt at a time and see if the sound stops. Check all tensioner bearings for any gritty or grinding same for any accessories