Coolant disappearing and can't find where

any white smoke from the exhaust? you might want to do a head gasket test

 

Coolant leak is a serious problem. It is necessary to urgently find the place where it is leaking.
It is worse if it is the engine.
The piston jamming from hydraulic shock, due to coolant leaking into one of the cylinders will provide a problem with engine replacement.

 

That coolant is going somewhere. Which coolant tank are you refilling?

 

A few Priuschatters have had problems with the exhaust heat recovery system leaking coolant directly into the exhaust.

 

he claims that it has already been bypassed, his second paragraph.

 

Maybe effectively stopped the leakage? He's a little vague:

@Tideland Prius could this thread be stickied:

TSB: Coolant leakage at front exhaust pipe (Prius & Prius Prime) | PriusChat

 

Pull all the spark plugs and compare the top of the pistons. They should all be universally black across the top. If coolant is leaking into one or two of them, the pistons tops will look like they been steam cleaned.

FWIW: white smoke out the exhaust pipe is a very large leak into exhaust pipe, milk shake engine oil is a coolant leak into the engine oil jacket. If there is a head gasket issue that's causing a misfire - coolant is going into the combustion chamber. Run it like that too long, you risk bending a rod or punching a hole in the side of your motor.

 

After cat heat exchanger.

 

Jan 22

Since July

Nov 8

Tuesday

Cars can go ten years without using any coolant. Any loss is an emergency.

Probably had the exhaust heat exchanger leak, eventually bypassed, but coolant loss occurred over a long period.

The engine overheated many times causing a blown head gasket. Good chance there is a warped head or block as well. A rebuilt or JDM engine should be the plan.

 

Did you mean OEM engine?
I am not sure he could import a JDM engine from Japan to the US, Typoes can be fun.

 

JDM engine from distributors in the US.

 

I thought JDM meant Japan Domestic Manufacturing, destined for the Japan market, not the US. I have seen posts of people with JDM Prius wanting help with the Japanese only interface, for instance.

 

Search JDM engines. They are used in Japan engines already imported to the US and sold at distributors in major US cities. Often in the $1200-$1500 range.

 

Sorry for my ignorant misunderstanding.