If your Prius is having a meltdown it might just be the water pump...
Here is the video of the guy talking about changing just the impeller.
ua-cam.com/video/1e18Id-tfqE/v-deo.html
I found these on Amazon but all the part numbers were for gen 3, I couldn't find any part numbers for gen 4.
www.amazon.com/dp/B0C1SQXGYZ/ref=sspa_dk_detail_2?psc=1&pf_rd_p=f734d1a2-0bf9-4a26-ad34-2e1b969a5a75&pf_rd_r=H30J9DHQ983W5DCP2H9Q&pd_rd_wg=iu89H&pd_rd_w=2riH4&content-id=amzn1.sym.f734d1a2-0bf9-4a26-ad34-2e1b969a5a75&pd_rd_r=f02354ad-13fa-494f-bd3e-dffe6a193eff&s=automotive&sp_csd=d2lkZ2V0TmFtZT1zcF9kZXRhaWw
Some of the water pump part numbers gen 3 to gen 4 are the same some are not i.e. Aisin gen 3 is wpt190, gen 4 is wpt205. Gates is 41500E for both gens. Go figure