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

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    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.
     
  2. sam spade 2

    sam spade 2 Senior Member

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    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.
     
  3. Malik Wajahat

    Malik Wajahat Junior Member

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  4. Rebound

    Rebound Senior Member

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    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.
     
  5. Malik Wajahat

    Malik Wajahat Junior Member

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    Is there any sign of pump or valve failure? Like in speedometer....

    Posted via the PriusChat mobile app.
     
  6. Malik Wajahat

    Malik Wajahat Junior Member

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  7. bisco

    bisco cookie crumbler

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    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
     
  8. bisco

    bisco cookie crumbler

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    a lot of people replace the engine because it is cheaper
     
  9. Mendel Leisk

    Mendel Leisk Sand Pounder

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