Intermittent red triangle and heat without check engine light

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by Jama707, Oct 16, 2022.

  1. Jama707

    Jama707 Junior Member

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    Prius 2007 @ 198k.

    I’m getting intermittent red triangle with beep and also heat blows hot intermittently. And there’s also high temp warning on MFD. But no check engine light - no engine noise or knock.

    My brother overfilled the oil and drove with it - I’ve just replaced it and it’s now within the normal level.

    Its 12v was replaced a few months ago. And the inverter coolant have turbulence.

    The coolant overfill was almost empty added some more coolant.

    Im not sure what could be the problem. Is there way I could pressure test the coolant system? Or any other tests?
     
    #1 Jama707, Oct 16, 2022
    Last edited: Oct 16, 2022
  2. JC91006

    JC91006 Senior Member

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    You should actually check the coolant at the radiator, not the overfill/reservoir. The radiator cap is under the front engine cover
     
    #2 JC91006, Oct 16, 2022
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  3. Tombukt2

    Tombukt2 Senior Member

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    Inverter pump
     
    #3 Tombukt2, Oct 16, 2022
  4. ChapmanF

    ChapmanF Senior Member

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    And while you can check in the overflow bottle any time (it's not pressurized), do not loosen the radiator cap except when the engine is fully cooled down.
     
    #4 ChapmanF, Oct 16, 2022
  5. Jama707

    Jama707 Junior Member

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    Close off the loop - it didn’t notice it was missing serpentine belt. I don’t know how I missed it. After $28 OEM serpentine belt it runs fine.
     
    #5 Jama707, Nov 5, 2022
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  6. mr_guy_mann

    mr_guy_mann Senior Member

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    Good find! Might want to just replace the pulley for the belt- it's probably original and might not go too much longer.

    Posted via the PriusChat mobile app.
     
    #6 mr_guy_mann, Nov 6, 2022
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