Does anyone know why my car is squealing when accelerating after replacing the water pump, also it's

There is no pulley for a water pump on a Gen3 .

The noise has to be coming from somewhere else.

As for the driving, is a caliper stuck? What is the brake pad depth?

Good luck and keep us posted .

 

Air still in your system?

 

How did we get from the water pump to a flat (tire) ??
And since when does a flat tire make a squealing noise ??

I would think that someone who has just changed the water pump would know if it is belt driven or not.

Something really strange about this post.

 

There is a crankshaft pulley, but there is no belt around it on the Gen 3. The pulley is part of the harmonic balancer used for multiple applications; belt driven accessories being one of them; but NOT on the Prius.

The noise could be coming from the brakes or CV joints or shafts.. I'm not there to listen to it. So, I can't be sure.

 

A portion of the fender liner has to be removed in order to access the water pump. A loose fender liner will cause a flapping sound that is similar to a flat tire.

Are you sure you re-secured the fender liner properly? Any missing or loose clips?

 

Try uploading to YouTube.

 

Could be a bent dust shield rubbing on the rotor too

 

I am surprised no one mentioned a bad wheel bearing. Check me, but I think the rear wheels have them. If the sound changes or disappears when the weight shifts to the side, driving on a ramp for example, that would be a confirmation. Listen for the change on both left and right-hand curves.