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coolant heat storage pump keeps running

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by beezar, Feb 25, 2020.

  1. beezar

    beezar Junior Member

    Joined:
    Jan 19, 2016
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    Location:
    Houston, TX
    Vehicle:
    2012 Prius
    Model:
    Three
    From what I understand, the around 5 second humming noise the Prius makes after the engine shuts off is the coolant heat storage pump. My car used to only make this humming noise maybe once after the engine was shut off, and occasionally when idling at a stop light.

    However, recently, the car has been making this noise once a minute, while driving, at a stop light, and several times after the engine is shut off. Is there a way I can troubleshoot this/fix it? There are no warning lights on. Thanks
     
    #1 beezar, Feb 25, 2020
  2. Mendel Leisk

    Mendel Leisk EGR Fanatic

    Joined:
    Oct 17, 2010
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    Location:
    Greater Vancouver, British Columbia, Canada
    Vehicle:
    2010 Prius
    Model:
    Touring
    Could be brake accumulator problems, @ChapmanF might weigh in. There is no coolant heat storage pump on third gen, just a second gen component.
     
    #2 Mendel Leisk, Feb 26, 2020
    pjksr02 and jerrymildred like this.
  3. jerrymildred

    jerrymildred Senior Member

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    Two
    Nearly the exact thing I was going to say. (y)(y)
     
    #3 jerrymildred, Feb 26, 2020
    Mendel Leisk likes this.
  4. Rebound

    Rebound Senior Member

    Joined:
    Mar 11, 2010
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    Portland, OR
    Vehicle:
    2012 Prius Plug-in
    Model:
    Plug-in Base
    Please verify for us that your car is 2010-2015 model year. Record a short video with the sound, make sure the sound is accurate, and post it to YouTube for us.

    Toyota May cover this at no charge, even out of warranty.
     
    #4 Rebound, Feb 26, 2020
    jerrymildred and Mendel Leisk like this.
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