Coolant disappearing and can't find where

Discussion in 'Gen 4 Prius Care, Maintenance and Troubleshooting' started by Carsten, Jan 22, 2025 at 7:22 PM.

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  1. Carsten

    Carsten Junior Member

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    Hey all,

    2017 Prius 2 So I'm having to add a little coolant like every other day, probably put in almost 2 gallons over 6 months and it seems to be going quicker now. I don't see any drip on the ground and am not finding any leakage at hose connections I can easily reach. Not seeing any residue, but I assume it's hitting the engine and boiling off.

    I know the heat exchanger has been a problem on these, that has been disconnected and the lines that went to it removed, I can reach in and feel where it was bypassed, no leak.

    Is there anything else I can do before I have to take it to a pro?

    Thanks
     
    #1 Carsten, Jan 22, 2025 at 7:22 PM
  2. bisco

    bisco cookie crumbler

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    any white smoke from the exhaust? you might want to do a head gasket test
     
    #2 bisco, Jan 22, 2025 at 8:36 PM
  3. MAX2

    MAX2 Member

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    Coolant leak is a serious problem. It is necessary to urgently find the place where it is leaking.
    It is worse if it is the engine.
    The piston jamming from hydraulic shock, due to coolant leaking into one of the cylinders will provide a problem with engine replacement.
     
    #3 MAX2, Jan 22, 2025 at 10:29 PM
  4. BiomedO1

    BiomedO1 Senior Member

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    That coolant is going somewhere. Which coolant tank are you refilling?
     
    #4 BiomedO1, Jan 22, 2025 at 10:57 PM
  5. Leadfoot J. McCoalroller

    Leadfoot J. McCoalroller Senior Member

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    A few Priuschatters have had problems with the exhaust heat recovery system leaking coolant directly into the exhaust.
     
    #5 Leadfoot J. McCoalroller, Jan 22, 2025 at 11:43 PM
  6. BiomedO1

    BiomedO1 Senior Member

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    he claims that it has already been bypassed, his second paragraph.
     
    #6 BiomedO1, Jan 23, 2025 at 1:27 AM
  7. Mendel Leisk

    Mendel Leisk Witness Leader

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    Maybe effectively stopped the leakage? He's a little vague:
    @Tideland Prius could this thread be stickied:

    TSB: Coolant leakage at front exhaust pipe (Prius & Prius Prime) | PriusChat
     
    #7 Mendel Leisk, Jan 23, 2025 at 12:38 PM
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