Loud humming sound under the hood

Discussion in '3rd Gen - 2007 - 2017' started by MCW94, Feb 13, 2020 at 10:07 AM.

  1. MCW94

    MCW94 New Member

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    In the morning when we unlock our Expedition with the key fob, there is a loud weird humming sound that comes from under the hood. Is there an actuator or a pump that could be cycling on before start up?
     
  2. bobmbx

    bobmbx Full Access Members

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    Welcome to the forum.

    Describe your Expy...year, trim, options, etc....
     
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  3. MCW94

    MCW94 New Member

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    2007 Expedition EL Limited 219,000 miles
     
  4. Flexpedition

    Flexpedition Full Access Members

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    If equipped with air leveling rear suspension, I'd speculate the noise is the compressor, located below'ish the passenger headlight. Not uncommon for a little deflation on cold overnights.
     
  5. MCW94

    MCW94 New Member

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    No air suspension. To me it sounds like when you turn the key to accessory and the motor starts getting primed to start, but its a lot louder
     
  6. The Wiped Cam

    The Wiped Cam Active Member

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    edit: disregard. I thought the noise was heard after starting the engine
     
  7. JExpedition07

    JExpedition07 Marinized Member Supporting Member

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    On my 2007 EL Eddie Bauer the things that are energized when I hit unlock on the remote fob are headlights (if dusk) and memory features are enabled so mirrors and seat/pedals move to set point if their position was changed last ignition cycle. Not sure what else energizes when you hit unlock besides these items. Possible your adjustable pedals are stuck and trying to move maybe?
     
    Last edited: Feb 13, 2020 at 10:50 PM
  8. JExpedition07

    JExpedition07 Marinized Member Supporting Member

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    I wonder if you have a Relay buzzing in the under hood distribution box. Here is one humming on a 2007 F-150 but on the interior box.....however both boxes have these relays.

     

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