Pardon but I'm still confused about Prime coolant change.

tricks for coolant change on 2020 Primes? | PriusChat
Got some info, but don't understand the desire for special equipment that "only takes about 20 minutes".

Without special equipment from this Prime SPECIFIC youtube it seems fairly straightforward.

1)You drain, removing air cap from engine side. Close drains.
2)Refill, replace air cap, maybe squeeze engine side big hoses to get some more air out.
On Refill, pay close attention to how much each side is Refilled, as that will tell you if you got air still in system and about how much.
3)Run engine (I can't see any reason to put it in "Maintenance Mode") for a bit to top off coolants.
4)Replace coolant tank caps, run engine some more, maybe short drive around block.
5)Check levels (allow to cool before opening to top up).
6)Drive some more, keep an eye on levels.

Pretty much like any coolant change as far as I can see. In my other thread someone was talking about extended burping if you don't use the Special Equipment gizmo. Does that apply to PRIMES and besides checking and topping off coolant at most a couple times, how much burping is going on???

No extended burping was mentioned in the Toyota manuals for 2016 (non-Prime) supplied by Mendel in my original thread.

Is the only advantage of the Special Equipment method that you can be "all done and out the door" in 20 minutes so it might matter if you are a shop with a stack of other money making jobs to get to....
but not so much for a DIY who has a couple other spare cars, so letting it cool and check a few hours later not really any issue???

 

thx again, I now see that is for 4th gen (17-22), just I guess first published in 2016.

 

I got only .75 quart out of inverter (3.5cups) and 3.5 quarts out of engine (14cups).
I did remove both filler caps and the 6mm hex air vent from engine.
What could I be doing wrong?

Both those are about 1/2 the spec capacities.
Oh, well, I guess I'll refill and count this as a "re-fresh" and figure out what is going on later.

I do see a couple hoses and bottom or radiator that lies below the drains, but not enough to account for anything near 1/2 total volume.

 

Oh, thx. IIRC one YouTube the guy blows air, and IIRC he also says he used almost 2 gallons or pretty close to the spec capacity.
I did hear some buzzing when I powered up to EV Mode and coolant in one (can't remember which) or both dropped a bit. What was that? Some pump in the inverter?

I'd recommend doing coolant at more often than recommended on Toyotas. My metals experts tell me the alum alloy that is best for machining stuff like engine heads for mechanical wear and valve seating is also more prone to corrosion on the coolant side. My old Toyota truck finally gave up the ghost at about 380K due to porous aluminum head, and that just happened to be the one part you couldn't find even in rebuild-able condition for that model. I changed the oil but didn't think about coolant much.

Genuine Toyota Parts - Genuine Toyota Fluid 00272-1LLAC-01 Long Life Coolant - 1 Gallon (002721LLAC01)
probably do this next with distilled water flush.