Replace All cooling system coolant

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by Emad, Dec 14, 2017.

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  1. Emad

    Emad Junior Member

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    Hello All,

    Last week i replaced the heater radiator, and fill it with tap water instead of SSL because i need to replace the water reservoir tank too. i replace the tank and bought 4 liters of Toyota Genuine SSL coolant, but still didnt put them in the cooling system.

    i need to drain the cooling system of all its coolant and put the SSL.
    my questions are:
    1- How many liters i need to fill all the system?
    2- how to drain the system and refill it ?


    Thanks,
     
  2. Patrick Wong

    Patrick Wong DIY Enthusiast

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    For G3, I believe the engine coolant system capacity is 7.3 liters (7.7 US qts, 6.4 lmp. qts). The correct coolant is Toyota Super Long Life Coolant (SLLC) which has a pink color and is premixed with distilled water.

    The vehicle has a radiator drain plug and engine block drain plug. You need to find and open both of those to do a complete job of draining the coolant.

    You also need to find the air release valve which is in the plumbing to the cabin heater, when refilling the system.
     
    #2 Patrick Wong, Dec 16, 2017
    Last edited: Dec 16, 2017
  3. JimboPalmer

    JimboPalmer Tsar of all the Rushers

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  4. Colm01

    Colm01 Member

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    Don't forget to drain the heat exchanger down on the exhaust under the cabin.
     
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  5. Mendel Leisk

    Mendel Leisk Senior Member

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    There's two @NutzAboutBolts videos linked in post #3, the one on engine coolant change in particular is invaluable.

    Since you have what amounts to "contamination", having added so much water, post #4 is also a good idea. It is likely THE low point in the system. Basically follow the exhaust pipe, somewhere (just downstream of the CAT?) is the location where coolant line connects to exhaust system.

    Also, consider opening the engine block drain bolt: though I've heard precious little drains from it? It's funny, on all our previous Hondas, the engine block bolt was the motherlode: remove that and be prepared for deluge.

    It is hard to reach, you're likely best option is to remove the wipers and windshield cowl, and even then you'll need mirrors and braille to get to it, around the exhaust side. I believe it has a spigot similar to radiator drain bolt? I've "touched" it with cowl off, and seen a fuzzy shaky view of it with a mirror. Access is terrible. It's up high on the passenger side, at the back.

    For cowl removal, watch @NutzAboutBolts spark plug change video, pinned at top of 3rd gen maintenance forum.
     
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  6. mjoo

    mjoo Senior Member

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    Meh, I'd just change the coolant 5k miles sooner than to mess with the engine block drain bolt.

    Is there a petcock or plug on the heat exchanger?

    Pixel XL ?
     
  7. Mendel Leisk

    Mendel Leisk Senior Member

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    AFAIK you just pull off a hose. It's not mentioned in the repair manual, but I'm sure you'd get more out doing that. What with substantial water addition, you want as complete a drain as possible.

    Would be nice if you could get 100% coolant. Then you could get away with a regular drain, maybe check the percent of the drain, do some math.

    Actually that would be a good first step regardless, see what percent it's at first.

    Also fwiw, in Canada the dealerships sell 55%.
     
  8. Mendel Leisk

    Mendel Leisk Senior Member

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    Anybody know of an antifreeze tester that just shows percent, as opposed to freeze protection temperature? Or do you just throw-in-the-towel: reverse-engineer from the temperatures? Maybe the temperature of the coolant matters too?
     
  9. Mendel Leisk

    Mendel Leisk Senior Member

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    I think the last time I wrestled with this what I did was, starting with 100% anitifreeze:

    1. Mixed 60%, 50% and 40% samples.
    2. Let them stabilize to practical room temperature. (Note this temp, use it with any future checks.)
    3. Measured each with one of those temperature-calibrated hydrometers, and carefully mark with a black felt-tip, where the needle ended up with each percent.

    Bit of a pain but it worked.

    The fly in the ointment though: I guess it's impossible to do this with Toyota antifreeze, which only comes premixed. The best you can do with the US 50% mix would be do steps 1 through 3 for 50% and 40%. No way to do 60%.
     
  10. CR94

    CR94 Senior Member

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    Yes. Many of the hinged--pointer type do that, including my old Prestone one.
     
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  11. CR94

    CR94 Senior Member

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    Addendum: I should've said they show percentages as well as temperatures. Coarse graduations, tho.
     
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