Red triangle cooler problem

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Hi.

I have a Toyota Prius 2005 gen2
and I have a cooling problem.
I get the red triangle warning on temp.
But I can change gear to B and spin up the engine and then to temp go down.
I have a OBD and this happens now quite often,
but I just put gear in B and spin up engine and then temp go down.
There is no leaking and I have only heat in cabin sometimes if I spin up engine long time enough.

What is going on?

( PS: I probably wrote this in wrong part of forum and will paste same in another part.
Please remove if it is wrong here.)

Regards from Sweden
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I still get a red triangle warning and over heat in display.
Before I drive i burp the cooling system on air.
I then can drive and get heat in cabin for some miles.
Then heat to cabin go away.
I then accelerate and then get heat again.
Then cold air so again I accelerate to get heat again.
Then I need to stop and burp the system on air and sometimes need to fill it up with cooling water.
I have changed water pump but that was not the problem.
I changed the thermostat and a temp sensor on the cooler.
When I accelerate all yellow warning signs light up now.
But when I burp the cooling system on air, I get heat in cabin and all yellow warning signs go away.
What is the problem ?

Regards Magnus

 

I have now replaced my engine but it do not run for long.
It start and then just stop.
Anyone know why?

MagI
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I replaced my engine and when loading my trunk battory I get the engine to start just some seconds then it shut off.
But I can drive on the battery.
When I drive, the engine do not start, to load the battery.
I get the code: P0A3F
Anyone know what to do?

Regards MagI
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They did not connect the camshaft sensor.

It now start but is rattling some times.
Toyota say I need to replace the camshaft sensor.
Is there any video that show how to do that?
Cant seem to find one good enough for me to see how to.

The engine I got have been laying on a storage for some years.
Anything else I should check or clean,
if a engine been some years on storage?

MagI
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