White smoke and coolant boiling

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by Malik Wajahat, Sep 6, 2021.

  1. Malik Wajahat

    Malik Wajahat Junior Member

    Joined:
    Dec 12, 2018
    5
    0
    0
    Location:
    Islamabad Pakistan
    Vehicle:
    2010 Prius
    Model:
    Premium w/ Solar Cells
    I am heaving toyota prius 2010 moonroof, 200,000 km mileage,
    1. When coming down from hill to flat surface it gives white smoke once and also burns engine oil a little bit.
    2. Few months ago I was not in the car but car was on with ac in my absence high speed fan was off and car was over heated, I filled with water because coolant was out, after 2 days I observed fans are not working properly I changed relay and everything was fine but when I drive at 130 km/h heat red sign appears and she throws coolant out half.
    Some said gasket problem
    Some said EHRS problem
    Some said change engine assembly
    My coolant life is over.
    I Could not understand the EHRS valve working or not working correctly.
    Gasket. There is no sign observing gasket car is heating at crossing 120,at speed of 100km/h to 117 not decreasing coolant or any sign of heating over 400 km.
    Kindly guide me thanks.

    Posted via the PriusChat mobile app.
     
    #1 Malik Wajahat, Sep 6, 2021
  2. sam spade 2

    sam spade 2 Senior Member

    Joined:
    Mar 31, 2018
    7,035
    2,798
    0
    Location:
    USA
    Vehicle:
    2017 Prius c
    Model:
    Four
    No way to give significant help without being there BUT............
    It sure sounds like a head gasket.

    If they can get past the fact that it is a hybrid, most any fully equipped auto shop should be able to do some pressure tests on the head gasket.

    If that IS the problem and you continue to drive it, your options will eventually go down to 1......when the engine seizes up and has to be replaced.
     
    #2 sam spade 2, Sep 7, 2021
  3. Malik Wajahat

    Malik Wajahat Junior Member

    Joined:
    Dec 12, 2018
    5
    0
    0
    Location:
    Islamabad Pakistan
    Vehicle:
    2010 Prius
    Model:
    Premium w/ Solar Cells
    #3 Malik Wajahat, Sep 9, 2021
  4. Rebound

    Rebound Senior Member

    Joined:
    Mar 11, 2010
    3,970
    2,623
    0
    Location:
    Portland, OR
    Vehicle:
    2012 Prius Plug-in
    Model:
    Plug-in Base
    I am not certain, but it could also be the coolant pump. If the coolant pump (Prius has two) is failing, the engine will overheat and you'll get all the signs of an overheated engine. This can lead to blown headgasket and other bad things.

    Prius has an electric coolant pump and they are known to fail.
     
    #4 Rebound, Sep 9, 2021
  5. Malik Wajahat

    Malik Wajahat Junior Member

    Joined:
    Dec 12, 2018
    5
    0
    0
    Location:
    Islamabad Pakistan
    Vehicle:
    2010 Prius
    Model:
    Premium w/ Solar Cells
    Is there any sign of pump or valve failure? Like in speedometer....

    Posted via the PriusChat mobile app.
     
    #5 Malik Wajahat, Oct 13, 2021
  6. Malik Wajahat

    Malik Wajahat Junior Member

    Joined:
    Dec 12, 2018
    5
    0
    0
    Location:
    Islamabad Pakistan
    Vehicle:
    2010 Prius
    Model:
    Premium w/ Solar Cells
    #6 Malik Wajahat, Oct 13, 2021
  7. bisco

    bisco cookie crumbler

    Joined:
    May 11, 2005
    111,565
    50,804
    0
    Location:
    boston
    Vehicle:
    2012 Prius Plug-in
    Model:
    Plug-in Base
    that wouldn't do it. many failures show up on an obd scan. do you have access to tech stream?

    there are specific head gasket tests. but even if it is the head gasket, the rest of the engine must be checked for over heating damage
     
    #7 bisco, Oct 14, 2021
  8. bisco

    bisco cookie crumbler

    Joined:
    May 11, 2005
    111,565
    50,804
    0
    Location:
    boston
    Vehicle:
    2012 Prius Plug-in
    Model:
    Plug-in Base
    a lot of people replace the engine because it is cheaper
     
    #8 bisco, Oct 14, 2021
  9. Mendel Leisk

    Mendel Leisk Senior Member

    Joined:
    Oct 17, 2010
    58,430
    40,234
    80
    Location:
    Greater Vancouver, British Columbia, Canada
    Vehicle:
    2010 Prius
    Model:
    Touring
    #9 Mendel Leisk, Oct 14, 2021
  10. Malik Wajahat

    Malik Wajahat Junior Member

    Joined:
    Dec 12, 2018
    5
    0
    0
    Location:
    Islamabad Pakistan
    Vehicle:
    2010 Prius
    Model:
    Premium w/ Solar Cells
    Thanks a lot for your guidance.
    Getting heat problem was fixed with changing the electrical water pump.
    But still stuck in white smoke, valve seals problem?
    White smoke only comes when coming down from hills.
    Coolant is still as it was.
    OIL burns when it smoked and smells like burning oil.
    2. Bad disk breaks can turn on abs light, in rain every thing perfect but in hot times it turns on abs lights.
    Looking for your guidance.
    Thanks

    Posted via the PriusChat mobile app.
     
    #10 Malik Wajahat, Jun 24, 2022
  11. sam spade 2

    sam spade 2 Senior Member

    Joined:
    Mar 31, 2018
    7,035
    2,798
    0
    Location:
    USA
    Vehicle:
    2017 Prius c
    Model:
    Four
    OK then that sounds like worn out piston rings.
    A compression test would be in order.
    How often do you have to add oil ?
    Doing a search for "compression" or "low compression" or "piston rings"
    might give you some more ideas too.
    There probably is NO easy fix.
    Your engine likely is just worn out.
     
    #11 sam spade 2, Jul 2, 2022
  12. bisco

    bisco cookie crumbler

    Joined:
    May 11, 2005
    111,565
    50,804
    0
    Location:
    boston
    Vehicle:
    2012 Prius Plug-in
    Model:
    Plug-in Base
    maybe a damaged wiring harness
     
    #12 bisco, Jul 2, 2022
(You must log in or sign up to post here.)