2011 Prius with codes 261b and 261c any help is appreciated.

I have an old 2012 Prius with 178000 miles on it with error codes of 261B Coolant Pump "B" Control Circuit Performance / Stuck Off and 261C Coolant Pump "B" Control Circuit Low. It drinks water, I can drive about 3 miles and have to stop and put Water into it. During the 3 mile drive before the error code I get the Check Engine light stays on even if I clear the codes and then after about 3 miles the engine temp goes past 210 upto 255, at that same time I will get the triangle of death and the pulll over to a safe place blah blah sign, I forgot what it says but You all know the warning. The gas engine still runs but the electric Engine kicks out. Then just a few yards later the car will just shutoff and cost with the red steering wheel thing over next to the check engine light and the car just loses all power. This has been haping for almost a year. I just pull over reset the codes turn the car off and back on and drive another 3 miles and do it all over. Yes it takes a long time but it is what I have to do. I have a friend that works at a Toyota dealship in the repair department has for 20 or so years. He tells me has to do with the water pump and to repair that you have to move part of the engine to get to it. Which I believe is true I have known this guy for about 14 years and you can see the water pump below the engine on the left side. Andhe said you are looking at between 3,000 and 4,000 to repair. So I just figured it is time for a new one. So I have a deposit on a 2019 Prius Prime Plus with 46,100 miles for 22,376 which I think is a good deal because it also qualifies for the tax credit from the government making it like 18,000.Any thoughts you can give would be appriecieated.