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    4.0L SOHC High Pitched Whistling Noise

    Not a whistle, exactly. More like a very high-pitched humming noise. Sometimes intermittent, sometimes constant. But most importantly, it occurs only when all three conditions above are present (ie, hot day, high speed, & vehicle has been running for at least 10 minutes).
  2. A

    4.0L SOHC High Pitched Whistling Noise

    This very annoying high-pitched squealing sound definitely seems electronic in nature. On my 2007 Sport Trac, it occurs ONLY WHEN: 1). It is a hot day (85 F or higher); and, 2). The car is running at 65 MPH or higher; and, 3). The car has been running for at least 10 minutes. This awful noise...
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