1. The site is migrating to a new server this week, so there will likely be some downtime during that process. You can follow along here for updates.

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

    Joined:
    Dec 26, 2018
    43
    18
    0
    Location:
    SACRAMENTO, CA
    Vehicle:
    2011 Prius
    Model:
    Base
    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

    Joined:
    Nov 10, 2013
    16,227
    8,264
    0
    Location:
    Los Angeles, CA
    Vehicle:
    2008 Prius
    Model:
    II
    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
    Jama707 likes this.
  3. Tombukt2

    Tombukt2 Senior Member

    Joined:
    Nov 29, 2020
    5,484
    966
    0
    Location:
    Durham NC
    Vehicle:
    2009 Prius
    Model:
    Base
    Inverter pump
     
    #3 Tombukt2, Oct 16, 2022
  4. ChapmanF

    ChapmanF Senior Member

    Joined:
    Mar 30, 2008
    21,594
    14,057
    0
    Location:
    Indiana, USA
    Vehicle:
    2010 Prius
    Model:
    IV
    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

    Joined:
    Dec 26, 2018
    43
    18
    0
    Location:
    SACRAMENTO, CA
    Vehicle:
    2011 Prius
    Model:
    Base
    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
    Tombukt2 likes this.
  6. mr_guy_mann

    mr_guy_mann Senior Member

    Joined:
    Sep 3, 2020
    2,874
    1,167
    0
    Location:
    NJ-USA
    Vehicle:
    2006 Prius
    Model:
    Four
    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
    Jama707 likes this.
(You must log in or sign up to post here.)
Loading...
Similar Threads - Intermittent triangle heat
  1. 24gzerancr

    P3000 / P0A84 Code and Triangle Warning Light. Hybrid Cooling Fan loses power intermittently

    24gzerancr, Jun 26, 2023, in forum: Gen 2 Prius Care, Maintenance and Troubleshooting
    Replies:
    14
    Views:
    635
    24gzerancr
    Jun 28, 2023
  2. Hanging on with 286k

    2007 intermittent red triangle

    Hanging on with 286k, Dec 15, 2022, in forum: Gen 2 Prius Care, Maintenance and Troubleshooting
    Replies:
    6
    Views:
    529
    Hanging on with 286k
    Dec 19, 2022
  3. bikeking19

    Got red triangle and P lock error while driving on highway

    bikeking19, Sep 20, 2022, in forum: Gen 2 Prius Care, Maintenance and Troubleshooting
    Replies:
    5
    Views:
    960
    mr_guy_mann
    Sep 21, 2022
  4. ElectricSlide00

    HV Battery Shows Charged but Kicks Off Intermittently

    ElectricSlide00, May 17, 2022, in forum: Gen 2 Prius Care, Maintenance and Troubleshooting
    Replies:
    4
    Views:
    1,242
    mech1222
    May 21, 2022
  5. tarheeltango

    Intermittent error lights (triangle and hybrid system)engine code 2007 Prius

    tarheeltango, Aug 2, 2020, in forum: Gen 2 Prius Care, Maintenance and Troubleshooting
    Replies:
    5
    Views:
    2,395
    SFO
    Aug 3, 2020