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humming noise

Discussion in 'Air Conditioning' started by khalil, Apr 29, 2010.

  1. khalil
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    khalil Member

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    [Apr 29, 2010]
    hi all, wondering if someone could tell me if this is normal on a audi a3 2.0tdi 2004,
    when i have the climate control on, really low setting i hear a humming noise when the car is idle, if a rev it a little it goes away,
    just wondering if this is normal, maybe the noise is still there if the setting is on full but you cant hear it i guess with the all that air its pushing out,
    the heat/cold air everything seems ok,
    whats your thoughts?
    #1
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  3. drewbee
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    drewbee Member

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    [May 3, 2010]
    i just had my aircon regassed and i have the same problem.

    only when i turn off the econ button the humming starts.

    shall i be worried and called the compnay up who regassed the system?
    #2
  4. Staz
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    Staz is a retronaut Staff Member Moderator VCDS Map User

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    [May 3, 2010]
    It all depends on where the humming comes from. With the air con on there is an extra fan running and a belt driving a compressor, they're sources of noise of course. You'd be better off asking people who have cars of the same age and type in the relevant forums.
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  5. A4_MaJiK
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    A4_MaJiK Azeem

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    [Jun 26, 2014]
    x2 on this. Seems as though the humming is coming from the condenser fan.

    Azeem
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