Question about 2003 Lincoln Navigator

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Loud buzzing noise

My 03 Navigator is making a loud buzzing noise when the engine is first started. It makes it whether the AC is on or not. It stops when you start driving, but sometimes comes back on while driving as well. It also comes on with the key in power position but WITHOUT the engine actually being started. It almost sounds like an electrical noise.

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  • warlock61
    warlock61 May 11, 2010

    it sounds like the suspension pump. do you know where the shut off switch is?

  • yadayada
    yadayada May 11, 2010

    this is coming through the radio?

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From the sounds of it, it's simply your air ride's compressor. If you're not aware that your vehicle has air ride suspension, read up on the user's manual or look on the web. When you start your vehicle and shift into drive or reverse, your compressor should start (assuming no doors are ajar). The compressor than fills all four airbags in your vehicle to a factory-set height. These airbags provide a softer ride than the conventional shock/strut system seen in less expensive SUV's and trucks but are also more prone to problems and damage down the line. You can isolate the compressor as the sound by going to your truck, removing the left hand side panel and switching your air ride off. Your car's compressor then should not kick in at all. However, you should not operate your vehicle with this switch turned off. You should only use it as a diagnostic reference or anytime your car is towed, hoisted, or jacked up. Hope this helps.

Posted on Jan 22, 2009

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