New Inverter Pump: Am I Supposed To Hear Coolant Flow?

Discussion in 'Generation 1 Prius Discussion' started by DBD, Apr 22, 2025.

  1. DBD

    DBD New Member

    Joined:
    Mar 30, 2025
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    Location:
    Carbondale, Illinois
    Vehicle:
    2002 Prius
    Model:
    One
    Recently replaced the inverter pump after realizing it wasn't working and getting a check engine light (P3130).

    Zero coolant loss and I used a tight pair of pinch off tools so I didn't lose coolant and introduce air in the system.

    Starting out cold, it was very quiet and could only be seen as working by the turbulence. After a spirited drive, I noticed that I could hear the coolant movement with the cap on with lots of turbulence

    I have attached a video to demonstrate the sound after a spirited drive.

    So far the inverter isn't overheating. Is this normal for a G1 or do once warmed up I need to attempt to bleed the inverter coolant system?