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when i turn on the heat the AC comes on aswell ?

Discussion in 'Gen 1 Prius Plug-in 2012-2015' started by coolcarguy, Sep 24, 2014.

  1. coolcarguy

    coolcarguy New Member

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    Plug-in Base
    why when i turn on the heat on auto mode why does the AC also turn on and then i have to manually shut off the AC ?
     
  2. Tideland Prius

    Tideland Prius Moderator of the North
    Staff Member

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    A/C doesn't mean cooling. It's the conditioning of the air. In the summer, that means cooling it through the evaporator. In cool weather, it's meant to dehumidify the air so that your windows don't fog up (Turning on the windshield defroster also activates the A/C compressor as it blows dry air towards the window).