Engine coolant and inter-battery coolant

Discussion in 'Gen 4 Prius Care, Maintenance and Troubleshooting' started by Bk7king, Nov 26, 2021.

  1. Bk7king

    Bk7king Junior Member

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    My 2016 Prius three has 156,000 miles I changed the engine coolant and the inter-battery coolant at 100,000 miles is it necessary to do it now as the dealer suggests or could they get or wait until 200,000 miles. ?
     
  2. bisco

    bisco cookie crumbler

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    i would follow the maintenance schedule with your owners manuals.

    pay attention to time or miles, and severe duty
     
  3. alanclarkeau

    alanclarkeau Senior Member

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    Not sure what you meant "inter-battery coolant"? It's an air-cooled battery.
     
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  4. AzWxGuy

    AzWxGuy Weather Guy

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    Maybe spell-check for "inverter"?
     
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  5. Mendel Leisk

    Mendel Leisk Sand Pounder

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    ^This.

    Specifically, the US Warranty and Maintenance Booklet says:

    Engine Coolant: 100K miles or 10 years, whichever comes first
    Inverter Coolant: 150K miles or 15 years, whichever comes first
    Both, thereafter: 50K miles or 5 years, whichever comes first

    FWIW, Toyota Canada recommends to do both circuits at 160K kilometers (roughly 100K miles) or 10 years, and so on per the US.

    So yeah, you jumped the gun for the (US) inverter coolant change, and I'd say you're slightly overdue (by miles) for both an engine and inverter coolant change now, at 156K miles.
     
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  6. jdenenberg

    jdenenberg EE Professor

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    The 100k/50k mile coolant schedule is only if you use Toyota pre-mixed coolant. If you use the red concentrated coolant the 50k drops to 30k miles.
     
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  7. Mendel Leisk

    Mendel Leisk Sand Pounder

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    Specifically: Toyota Super Long Life Coolant.

    It's a bit frustrating that you can't get this concentrated, not pre-mixed with water: there are times when the cooling system needs a water flush (say to expel head gasket sealer products). When there's residual water in the system, the simplest way to subsequently get back to a 50/50 mix seems to be:

    1. Determine system capacity (spec in Owner's Manual)
    2. Add 50%* of that capacity, with full strength coolant
    3. Complete filling with distilled water.

    *FWIW: Toyota Canada supplies Toyota Super Long Life Coolant in a 55/45 coolant/water mix.
     
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  8. Bk7king

    Bk7king Junior Member

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    THANK YOU ALL ! Yes I meant inverter fluid. This is my third Prius prior 2 we’re totaled (not my fault) at 110 k miles and 135k miles. I over maintain my cars so I will get both fluids changed at nest oil change. My goals are always to get 250 k miles from a car.
     
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  9. Mendel Leisk

    Mendel Leisk Sand Pounder

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    With 4th gen and keeping up the maintenance, you'll likely get there. Third gen has an Achilles Heel, the #@*% newly minted EGR system, and the failing head gaskets, the second likely a consequence of the first. But keeping on top of that they're ok. Anyway, 4th gen, they seem to have worked out the kinks. (y)
     
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