I've searched everywhere & found nothing about bleeding the coolant from a gen 3 prius

Toyota removed the coolant bleed valve sometime in 2011, I believe, so you're correct, just dump in the coolant and gently squeeze the hoses. It will bleed itself, near as I can tell.

For your other problems... if you have an O2 sensor code, it's probably one of the O2 sensors. If you're overheating, it could be the engine coolant pump (which would explain why your heater doesn't work) or the thermostat. These pumps are electric and you don't want to use an engine that isn't circulating coolant; you'll blow the head gasket and maybe worse.

It's all do-able; you don't have a serious problem yet, just a part replacement.

 

Try the bleeder valve white platstic screw

 

Didn’t you add a bunch of stop leak?


iPhone ? Pro

 

You replaced the engine but the stop leak product went anywhere the coolant goes: the radiator, cabin heater core, and so on.

2013's don't have the bleed bolt, but maybe you can just disconnect the hose at the same junction? If there's air in the sytem, that's the high point and hopefully there'd be air right there.

Still, considering the stop leak, likely blobs of it everywhere, maybe a fool's mission till you get the entire coolant circuit flushed.

FWIW, the Blue Devil makers recommend 50/50 distilled water and white vinegar as a flush, but who knows. Be careful with that too, flush the vinegar out thoroughly asap, it'll corrode aluminum.

Stop Leak Will Come Back To Bite You | PriusChat

Best approach might be to get a "mechanical general contractor", someone or place trustworthy. Tell them the whole story, sort out a course of action. Just cutting your losses and selling the dang thing is one option.

 

You should see an alert: I mentioned you in another thread, where there is good news: a vinegar/water mix dissolves the stop leak gunk.

 

Yikes........