Coolant pump on storage tank operation

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by Rick 432, Jan 13, 2026 at 9:02 AM.

  1. Rick 432

    Rick 432 Member

    Joined:
    Aug 23, 2022
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    Location:
    Florida
    Vehicle:
    2007 Prius
    Model:
    Three
    I am hoping someone can help me with this issue. I replaced the coolant pump that is attached to the storage tank (front left) and I know that pump works as I bench tested it. For whatever reason, when I park the car after use that pump is not coming on and moving coolant into the tank. I am hoping someone knows what triggers that pump to turn on. I know the ECU turns it on but there must be a sensor etc. that tells the ECU to send power to that pump. I just want to know the sequence of events that turns that pump on. Thanks to all!
     
  2. ChapmanF

    ChapmanF Senior Member

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    Location:
    Indiana, USA
    Vehicle:
    2010 Prius
    Model:
    IV
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