Did the shop kill my Daughter's Prius?

Your dealer is lying to you then...there is no flush for the Prius trans. Maybe he's just misusing the word "flush" for change. A flush is needed to remove fluid that won't drain out of the torque converter by gravity so it must be "flushed" or pushed out by new fluid replacing it inside the torque converter. Most people on here try to get the dealer to change the trans fluid and are told "it's a lifetime" fluid. Wonder why your is pushing a "flush"? That being said, I guess lifetime fluid means when your transmission dies, that was it's lifetime. I drained and refilled mine (because that's all that is possible) at about 70k miles just to help it last longer. Yes it was turning dark (but no smell).
Stop leak is a band aid...it may last a while if the leak is small, but it will tend to gum up and block other small ports and Drainage holes inside the engine block (or the radiator if you're using some in there). There's a reason it's not the preferred, common fix for a leak.
I do wish you good luck on this I just believe either your shop took advantage of you or you are not fully understanding what they did to your car.

 

Then either he lied or he doesn't know what he's doing. The Prius transaxle is as different from the transmission in youy old Volvo as a meat grinder is different from an oil refinery. The Prius transaxle is marvelously simple. The typical automatic transmission is a miracle in that they don't fail more often than they do. @bettergolf explained it well.

The transaxle takes 3.5 quarts. So my guess is that they drained and filled it twice. Here's a pdf showing how it's done. (I've done this on four of my Prii so far.)

 

yikes, this is true.

 

Just editorial, should be quarts/litres.

 

usually I would just move on to the next thread but I must make a comment. Any mechanic who puts Blue Devil Stop Leak in your car should be avoided. Period. They are just trying to get you past the warranty period.

Just to let you know where you are, you have the exact problem that I had, a result of not cleaning the egr valve, a blown head gasket. No big deal. I wish any of my cars only had 160k on them I don't have any under 200k. I circled the place where the gasket failed and washed the piston. Any mechanic can replace your head gasket, make sure they send the head to the machine shop and replace the valve stem seals. Make sure they refill it with only Toyota coolant just because that's what belongs there. Shame you spent that much money on a repair that is doing more harm than good. That stop leak clogs up everything, which is bad. The car is worth fixing for sure. Good luck with it.

 

A few additional comments on the above-described debacle:

You might be able to flush the stop leak product with a 50/50 water vinegar mix. Test if you can extract a bit of the product.

Toyota sells a gasket kit, that has the head gasket, plus pretty much every other o-ring, gasket and seal in the engine. The mechanic and the machine shop can both use that.

Also worthwhile and safest to replace the head bolts.

The repair manual has some very specific instructions, regarding removal and reinstall of the head, torque instructions and so on.

Gasket kit and head bolt part no's in attached.

 

Avoided? That's too nice. I was thinking along the lines of communist punishment.

 

There is not a single "belt" in a Gen 3 Prius

Blue Devil?

the devil is in the details?

 

Yikes!! Sometimes the fingers have a mind of their own and the eyes see what they expect to see. Thanks, Mendel. I'm glad you caught that and that I saw your helpful comment in time to go back and edit my amazing brain fart.

 

I missed this earlier. @dig4dirt is correct. No belts ... well, except for the seat belts. LOL Here's Professor Kelly to show you what an amazing thing the Prius transaxle is. It's a deep dive into the transaxle in your Gen 3 Prius.

 

I find those videos impossible to watch; interesting as heck, but invariably I fall asleep, about half way through...

 

Youtube's "playback speed" setting can work wonders on a lot of videos. It does pitch correction, so the voices don't become chipmunks, and still are easy to follow. Turn on the closed captions and it's even easier. (Admittedly, for many videos, the closed captions are autogenerated and phonetic and distractingly comical. But for others they're added or checked by hand and they're accurate, and for the comical ones you can usually tell what they should have been.)

 

They are absolutely amazing! But yes falling asleep is part of the amazement!
I watched them many many times and I am still learning the amazement!

 

That might be more of an age issue. Happens to me, too.

 

when it’s late night and I can’t sleep, videos on here helps out.

 

Ditto...

 

Head gasket replacement reasonable price/worth it? | PriusChat
Your 2010 is a teenager at 160K miles, no reason at all not to fix it. It has to be done competently though. If you're getting a head gasket replacement done, the tech must check the connecting rods, else you'll be in the hole again after a few hundred miles.