My AC Compressor is Stuck On - Weird Issue

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by MyOtherCarIsAViper, Sep 25, 2025 at 7:56 PM.

  1. MyOtherCarIsAViper

    MyOtherCarIsAViper New Member

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    Location:
    Montana
    Vehicle:
    2008 Prius
    Model:
    Base
    So my AC compressor just started running full-out even with AC off.

    if I turn off AC through the climate control screen or turn the heat all the way up, the compressor is still running full out. I verified this with pressure gauges.

    I can get the compressor to shut off only if I turn off climate control completely (off button on the screen), but anytime climate control is on, the AC compressor is running its little heart out.

    Anybody heard of this before? Any known fixes? Currently, i'm planning on unplugging the compressor from the A/C board. Is this a bad idea?
     
    #1 MyOtherCarIsAViper, Sep 25, 2025 at 7:56 PM
  2. Tombukt2

    Tombukt2 Senior Member

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    Location:
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    Vehicle:
    2009 Prius
    Model:
    Base
    It's cooling off unplug till you can test. Something's calling for compressor.
     
    #2 Tombukt2, Sep 26, 2025 at 7:34 AM
  3. ChapmanF

    ChapmanF Senior Member

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    Location:
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    Vehicle:
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    Model:
    IV
    You don't, by any chance, have an outlet mode selected that includes the windshield?
     
    #3 ChapmanF, Sep 26, 2025 at 9:54 AM
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