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HOAT coolant instead of OAT

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by Abarnabe, Jul 30, 2024.

  1. Abarnabe

    Abarnabe Member

    Joined:
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    Vehicle:
    2010 Prius
    Model:
    III
    I have fully drained the engine and inverter coolant , but I have accidentally filled with HOAT or so called G12++ fluid instead of an OAT one.
    Now I found out that the prius does not like the silicate present in HOAT.

    I have driven 2 years with it without troubles, but I would like to correct this now.

    Question: Can I just drain the wrong fluid and fill up with the proper one or do I have to perform a flush?
     
    #1 Abarnabe, Jul 30, 2024
    Last edited: Jul 30, 2024
  2. Tombukt2

    Tombukt2 Senior Member

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    Nope you can drain it add a little of the proper fluid let it push out all the old fluid fill it with the right stuff and forget about it.
     
    #2 Tombukt2, Jul 30, 2024
    Abarnabe likes this.
  3. Abarnabe

    Abarnabe Member

    Joined:
    Jan 7, 2018
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    Location:
    Netherlands
    Vehicle:
    2010 Prius
    Model:
    III
    I have replaced the coolant with OAT as instructed.
    I understand that HOAT doesn't protect copper, brass and lead, so is our cooling cirquit made of that material?
    I think the ICE and its radiator are completely made of aluminium, but what about the inverter?
     
    #3 Abarnabe, Aug 10, 2024 at 3:32 AM
    Last edited: Aug 10, 2024 at 3:39 AM
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