1. Attachments are working again! Check out this thread for more details and to report any other bugs.

Red triangle cooler problem

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by jlivingstonsg, Dec 14, 2021.

Tags:
  1. jlivingstonsg

    jlivingstonsg Junior Member

    Joined:
    Dec 14, 2021
    9
    1
    0
    Location:
    Sweden
    Vehicle:
    2005 Prius
    Model:
    N/A
    ----
    Hi.

    I have a Toyota Prius 2005 gen2
    and I have a cooling problem.
    I get the red triangle warning on temp.
    But I can change gear to B and spin up the engine and then to temp go down.
    I have a OBD and this happens now quite often,
    but I just put gear in B and spin up engine and then temp go down.
    There is no leaking and I have only heat in cabin sometimes if I spin up engine long time enough.

    What is going on?

    ( PS: I probably wrote this in wrong part of forum and will paste same in another part.
    Please remove if it is wrong here.)

    Regards from Sweden
    ----
     
    #1 jlivingstonsg, Dec 14, 2021
    Last edited: Dec 14, 2021
    bisco likes this.
  2. JC91006

    JC91006 Senior Member

    Joined:
    Nov 10, 2013
    16,470
    8,383
    0
    Location:
    Los Angeles, CA
    Vehicle:
    2008 Prius
    Model:
    II
    Have you checked the coolant level at the radiator? It might be low
     
    #2 JC91006, Dec 14, 2021
  3. jlivingstonsg

    jlivingstonsg Junior Member

    Joined:
    Dec 14, 2021
    9
    1
    0
    Location:
    Sweden
    Vehicle:
    2005 Prius
    Model:
    N/A
    I still get a red triangle warning and over heat in display.
    Before I drive i burp the cooling system on air.
    I then can drive and get heat in cabin for some miles.
    Then heat to cabin go away.
    I then accelerate and then get heat again.
    Then cold air so again I accelerate to get heat again.
    Then I need to stop and burp the system on air and sometimes need to fill it up with cooling water.
    I have changed water pump but that was not the problem.
    I changed the thermostat and a temp sensor on the cooler.
    When I accelerate all yellow warning signs light up now.
    But when I burp the cooling system on air, I get heat in cabin and all yellow warning signs go away.
    What is the problem ?

    Regards Magnus
     
    #3 jlivingstonsg, Feb 19, 2023
  4. MCCOHENS

    MCCOHENS Member

    Joined:
    Oct 3, 2019
    189
    81
    0
    Location:
    Chalfont, PA
    Vehicle:
    2006 Prius
    Model:
    II
    It sounds like you are losing coolant while driving. If it is not leaking the head gasket might have failed, letting coolant into the combustion chamber. Look for white smoke from the exhaust pipe. Get the cooling system pressure tested to see if it holds pressure. The other possibility is an air bubble in the cooling system but that is not likely on this engine.
     
    #4 MCCOHENS, Feb 20, 2023
    jlivingstonsg likes this.
  5. jlivingstonsg

    jlivingstonsg Junior Member

    Joined:
    Dec 14, 2021
    9
    1
    0
    Location:
    Sweden
    Vehicle:
    2005 Prius
    Model:
    N/A
    I have now replaced my engine but it do not run for long.
    It start and then just stop.
    Anyone know why?

    MagI
    ......
     
    #5 jlivingstonsg, Jun 6, 2023
  6. jlivingstonsg

    jlivingstonsg Junior Member

    Joined:
    Dec 14, 2021
    9
    1
    0
    Location:
    Sweden
    Vehicle:
    2005 Prius
    Model:
    N/A
    -------
    I replaced my engine and when loading my trunk battory I get the engine to start just some seconds then it shut off.
    But I can drive on the battery.
    When I drive, the engine do not start, to load the battery.
    I get the code: P0A3F
    Anyone know what to do?

    Regards MagI
    -------------------------
     
    #6 jlivingstonsg, Jun 9, 2023
  7. dolj

    dolj Senior Member

    Joined:
    May 14, 2012
    7,508
    3,772
    0
    Location:
    Wellington, New Zealand
    Vehicle:
    2007 Prius
    Model:
    N/A
    My first thought would be to look up the Diagnostic Trouble Code Chart for that code and then follow the Inspection Procedure and see where that ends up.

    That code points to a problem with the position sensor circuit of position sensor circuit "A"; more specifically it has detected an interphase short in motor resolver circuit.

    The trouble areas are:
    • Wire harness or connector
    • Hybrid vehicle motor
    • HV control ECU
    I hope this helps
     
    #7 dolj, Jun 10, 2023
  8. mr_guy_mann

    mr_guy_mann Senior Member

    Joined:
    Sep 3, 2020
    3,253
    1,359
    0
    Location:
    NJ-USA
    Vehicle:
    2006 Prius
    Model:
    Four
    Did you remove the transmission when you replaced the engine? First thing to do is inspect the connections and wiring for the trans.

    Don't drive or try starting too often (until you find and correct the problem). Unless you have a way to charge the HV battery, it will discharge through use and then you will be stuck.

    Posted via the PriusChat mobile app.
     
    #8 mr_guy_mann, Jun 10, 2023
  9. jlivingstonsg

    jlivingstonsg Junior Member

    Joined:
    Dec 14, 2021
    9
    1
    0
    Location:
    Sweden
    Vehicle:
    2005 Prius
    Model:
    N/A
    -----
    They did not connect the camshaft sensor.

    It now start but is rattling some times.
    Toyota say I need to replace the camshaft sensor.
    Is there any video that show how to do that?
    Cant seem to find one good enough for me to see how to.

    The engine I got have been laying on a storage for some years.
    Anything else I should check or clean,
    if a engine been some years on storage?

    MagI
    -------------------------------------
     
    #9 jlivingstonsg, Jul 1, 2023
(You must log in or sign up to post here.)