Coolant Flush Service Questions

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by 15SuperPrius, Jan 6, 2021.

  1. 15SuperPrius

    15SuperPrius Member

    Joined:
    May 18, 2019
    168
    64
    0
    Location:
    FL
    Vehicle:
    2015 Prius
    Model:
    Two
    Hi all,

    My 2015 Prius’ odometer is closing up to 100k miles. I just had a service performed and the dealer is recommending a coolant flush (for both engine and inverter) at 100k miles. The car has been FLAWLESS to this point and I’m typically skeptical about having unnecessary services performed. The questions are:

    1) is this service indeed recommended at 100k miles?

    2) what’s the average price to have both coolants flushed at a dealer? I don’t have the space or bandwidth to perform the work myself, and I typically have my services performed at the dealer to maintain a paper trail.

    Thanks!
     
  2. jdenenberg

    jdenenberg EE Professor

    Joined:
    Nov 21, 2005
    3,438
    1,502
    1
    Location:
    Trumbull, CT
    Vehicle:
    2020 Prius
    Model:
    LE AWD-e
    There is no need to do a coolant "Flush" on a Prius. It just requires a drain and refill at 100k miles. You will need to do it every 50k miles thereafter if you use the super long life coolant.

    JeffD
     
    15SuperPrius likes this.
  3. rjparker

    rjparker Senior Member

    Joined:
    Jun 6, 2008
    3,815
    1,975
    2
    Location:
    Texas Hill Country
    Vehicle:
    2012 Prius v wagon
    Model:
    Three
    The thing to do is check your warranty and maintenance manual that came with the main owners manual. 100k miles is good for coolants and you will soon need spark plugs by the book. The dealer prices vary widely. You can also have most independent shops do it. The trick on the primary coolant is getting it all out. 73966C2E-CBAA-4CE0-AF93-509E157CA4C9.jpeg
     
    15SuperPrius likes this.
  4. jdenenberg

    jdenenberg EE Professor

    Joined:
    Nov 21, 2005
    3,438
    1,502
    1
    Location:
    Trumbull, CT
    Vehicle:
    2020 Prius
    Model:
    LE AWD-e
    The bigger issue is getting the air out of each cooling system by properly bleeding each one. Leaving a bit of the old coolant in each system is not a serious issue.

    JeffD
     
    15SuperPrius and davecook89t like this.
  5. davecook89t

    davecook89t Senior Member

    Joined:
    May 10, 2016
    1,020
    748
    0
    Location:
    Washington State, Florida
    Vehicle:
    2017 Prius
    Model:
    Four Touring
    For reference, I had the coolant drained and filled for both the ICE and inverter at our local dealer a couple of years ago on our Gen 2 Prius. They charged me $150 for each. That is probably too much to pay for the inverter drain and fill, which is much less problematic when it comes to getting all the air out of the lines, but I believe would be about the correct price for the ICE drain and fill (at least for the Gen 2, I would think your Gen 3 would have similar issues). I saw them working on the car for a couple of hours (presumably to bleed all the air out of the ICE cooling system), so I did not feel that I was ripped off.
     
    15SuperPrius likes this.
  6. rjparker

    rjparker Senior Member

    Joined:
    Jun 6, 2008
    3,815
    1,975
    2
    Location:
    Texas Hill Country
    Vehicle:
    2012 Prius v wagon
    Model:
    Three
    One of the things I don't have trouble with on a gen3 is getting air out of the system. Generally the amount of fluid that comes out is measured and new of the same quantity is put in. It will register perhaps 1" high but running it in maintenace mode until flow starts is enough to clear the system. However getting all the coolant out and exchanged takes more effort.
     
    15SuperPrius likes this.
  7. 15SuperPrius

    15SuperPrius Member

    Joined:
    May 18, 2019
    168
    64
    0
    Location:
    FL
    Vehicle:
    2015 Prius
    Model:
    Two
    Excellent. Thanks for your responses fellas!
     
  8. Mendel Leisk

    Mendel Leisk Sand Pounder

    Joined:
    Oct 17, 2010
    45,008
    32,157
    80
    Location:
    Greater Vancouver, British Columbia, Canada
    Vehicle:
    2010 Prius
    Model:
    Touring
    Engine change IS in the sched, 100k or 10 year. In US inverter circuit is delayed to 150k, but doesn’t hurt. The term “flush” is torn used interchangeably with drain and fill; I wouldn’t read too much into that.
     
    15SuperPrius likes this.
  9. 15SuperPrius

    15SuperPrius Member

    Joined:
    May 18, 2019
    168
    64
    0
    Location:
    FL
    Vehicle:
    2015 Prius
    Model:
    Two
    Thanks! The image posted a few posts above shows the drain for both the inverter and the ICE at 100k miles or 10 years. Has this changed, since you mentioned that the inverter has been pushed to 150k miles in the US?
     
  10. Grit

    Grit Senior Member

    Joined:
    Aug 22, 2017
    5,302
    3,732
    1
    Location:
    Wilkes Land
    Vehicle:
    2012 Prius
    Model:
    Four
    well it looks like my engine change way severely over due. Surprised it still runs!!! Going to find a jdm engine now.
     
    Mendel Leisk likes this.
  11. davecook89t

    davecook89t Senior Member

    Joined:
    May 10, 2016
    1,020
    748
    0
    Location:
    Washington State, Florida
    Vehicle:
    2017 Prius
    Model:
    Four Touring
    :ROFLMAO:,To add context, our Gen 2 had 211k miles when I bought it, with no record of either system's coolant ever having been changed. I put another 3k on it driving across the country before I had them changed. 80k miles later it seems to have suffered no ill effects, except that the Inverter Coolant Water Pump failed at around 275k, at which point the pump was replaced along with the coolant that had spilled.
     
    15SuperPrius likes this.
  12. rjparker

    rjparker Senior Member

    Joined:
    Jun 6, 2008
    3,815
    1,975
    2
    Location:
    Texas Hill Country
    Vehicle:
    2012 Prius v wagon
    Model:
    Three
    Not in my part of the US. Mendel lives in a northern part of america, although after today he may not want to associate with us.
     
    15SuperPrius and davecook89t like this.
  13. Mendel Leisk

    Mendel Leisk Sand Pounder

    Joined:
    Oct 17, 2010
    45,008
    32,157
    80
    Location:
    Greater Vancouver, British Columbia, Canada
    Vehicle:
    2010 Prius
    Model:
    Touring
    Toyota Canada says to change both coolant circuits at 160k kms or 10 years, whichever comes first. So last November, at 88k kms...
     
    15SuperPrius likes this.
  14. Mendel Leisk

    Mendel Leisk Sand Pounder

    Joined:
    Oct 17, 2010
    45,008
    32,157
    80
    Location:
    Greater Vancouver, British Columbia, Canada
    Vehicle:
    2010 Prius
    Model:
    Touring
    At first read yes, but follow the footnote (#3 IIRC), and you’ll see a contradiction: footnote says to delay inverter coolant change, to 150k miles or 15,years. Which governs, I think. That’s US sched. Including Nome Alaska I’d think.

    From Toyota Canada the official stance is 160k kms or 10 year for both. AND: there’s a decal on my inverter reservoir, that says to wait till 150k miles. I emailed them, and their response was to ignore the sticker. :)
     
    15SuperPrius likes this.
Loading...