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Curious.... what motor/pump starts when charge cord plugged in?

Discussion in 'Model S: Battery & Charging' started by Raven, Feb 25, 2013.

  1. Raven

    Raven Member

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    I'm just curious what's making the noise. It's not loud or concerning by any means. When I plug in the charge cord, a motor in the frunk area starts up, usual a higher pitch at first and then slowly winds down to a low, continuous hum for the remainder of charge. Anyone know?
     
  2. Todd Burch

    Todd Burch Voltage makes me tingle.

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    Pretty sure it's the compressor for the heat pump...to maintain battery temp while charging.
     
  3. Raven

    Raven Member

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    Makes sense. It's cold out.
     
  4. Todd Burch

    Todd Burch Voltage makes me tingle.

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    It could also be a pump to circulate the coolant...or both. Would love a user manual that explains all these noises...
     

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