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How to change inverter coolant 4th gen

Discussion in 'Gen 4 Prius Care, Maintenance and Troubleshooting' started by Leksvndr, Dec 20, 2019.

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  1. Leksvndr

    Leksvndr Junior Member

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    Hello, now I have 115k miles on my Prius. I want to change inverter coolant.
    Do you have any special instructions for it?
    Thank you.
     
    #1 Leksvndr, Dec 20, 2019
  2. alanclarkeau

    alanclarkeau Senior Member

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    Is this a Gen 3 or Gen 4?
     
    #2 alanclarkeau, Dec 21, 2019
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  3. Raytheeagle

    Raytheeagle Senior Member

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    Profile and thread title are conflicting:cool:.

    If talking about a gen4, I have an underside shot of our Prime with regards to the inverter drain:

    What did you do to your Prime today?

    Maybe we’ll find out soon(y).
     
    #3 Raytheeagle, Dec 22, 2019
    amos likes this.
  4. Leksvndr

    Leksvndr Junior Member

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    2016 year, I thought its a gen 4
     
    #4 Leksvndr, Dec 22, 2019
  5. krmcg

    krmcg Lowered Blizzard Pearl Beauty

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    My 2016 is a Gen 4...
     
    #5 krmcg, Dec 22, 2019
  6. Leksvndr

    Leksvndr Junior Member

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    if there is no resistance as in the photo, then the electric mode does not turn on at all. it began to happen quite often.
    If I drive without stopping for a couple of hours, then the temperature of the battery rises to 115-116 degrees. Is this normal?
     

    Attached Files:

    #6 Leksvndr, Dec 22, 2019
    Last edited: Dec 22, 2019
  7. Leksvndr

    Leksvndr Junior Member

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    My Prius is not a prime)
     
    #7 Leksvndr, Dec 22, 2019
  8. Raytheeagle

    Raytheeagle Senior Member

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    The engine bay layout is the same;).

    So why not help us out and eliminate the confusion we asked about:whistle:?

    We will help with more data that doesn’t conflict(y).
     
    #8 Raytheeagle, Dec 22, 2019
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  9. Mendel Leisk

    Mendel Leisk EGR Fanatic

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    4th gen Engine and Transaxle (& Inverter) Coolant Changes attached:
     

    Attached Files:

    #9 Mendel Leisk, Dec 22, 2019
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  10. Leksvndr

    Leksvndr Junior Member

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    Attached Files:

    #10 Leksvndr, Dec 22, 2019
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  11. Raytheeagle

    Raytheeagle Senior Member

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    So between @Mendel Leisk ’s manual guidance and the pics I took, you should be sorted:).

    Good luck and keep us posted(y) .
     
    #11 Raytheeagle, Dec 22, 2019
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  12. alanclarkeau

    alanclarkeau Senior Member

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    It'd be a good idea to change your profile - which shows "2012 Prius Plug-in" - or you'll get this question every time you post (or people will ignore you).
     
    #12 alanclarkeau, Dec 22, 2019
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  13. Mendel Leisk

    Mendel Leisk EGR Fanatic

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    Watch @NutzAboutBolts 3rd gen coolant change videos too, should be similar. Maintenance Mode procedure is handy too, at least for engine coolant change. I'm hitting the wall trying to find 4th gen procedure, guessing it's the same as 3rd gen (attached):
     

    Attached Files:

    #13 Mendel Leisk, Dec 22, 2019
  14. dy/dx

    dy/dx Junior Member

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    Hello,
    My Gen 4 Prius inverter coolant and engine coolant are mixed in the radiator. If I remove the engine coolant, inverter coolant goes down, if I add coolant in the inverter reservoir, it shows up also in the engine coolant reservoir. Is this normal?
     
    #14 dy/dx, Aug 2, 2020
  15. Mendel Leisk

    Mendel Leisk EGR Fanatic

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    I don't think that can be; it's two separate circuits, and two separate zones in the radiator.
     
    #15 Mendel Leisk, Aug 3, 2020
  16. dy/dx

    dy/dx Junior Member

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    Where in the system can they possibly mix? Radiator? Thank you for your time.
     
    #16 dy/dx, Aug 3, 2020
  17. Mendel Leisk

    Mendel Leisk EGR Fanatic

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    They can't mix anywhere; it's two separate systems. You can drain either system, without affecting the other.

    This image from the repair manual engine coolant change instruction seems to show the two zones in the radiator:

    upload_2020-8-3_6-37-37.png

    Note the hose is shown attached to a higher drain spigot. There's appears to be an extra zone at the bottom of the radiator, with a separate drain spigot (I've coloured it yellow). That I believe is for the inverter coolant.

    Here's the repair manual info for both:
     

    Attached Files:

    #17 Mendel Leisk, Aug 3, 2020
    Last edited: Aug 3, 2020
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  18. dy/dx

    dy/dx Junior Member

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    Thank you.
     
    #18 dy/dx, Aug 4, 2020
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  19. Solarj

    Solarj Junior Member

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    Do you need the Toyota Tech Stream to run the pump to evacuate the air? I have a 16 I am wanting to do the inverter and coolant replacement.
     
    #19 Solarj, Aug 13, 2020
  20. Mendel Leisk

    Mendel Leisk EGR Fanatic

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    I can post repair manual excerpts tomorrow, if you’re still interested. IIRC it’s sim to 3rd gen.
     
    #20 Mendel Leisk, Jan 15, 2021
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