Prius 2010 overheating

Part of the cooling system for engine is not just the radiator, but the cars heater also and even to include the inverter cooling. I would drain all systems, flush good and refill with the correct coolants. Is the radiator thermostat working? I see you changed it. Fans not working when overheating, that’s a clue. Many times a overheating problem can be fixed by using the cars heater and heating fan. Sort of like a spare radiator. As for your other professional opinions, without adequate explanations, I have no opinion. As for a blown head gasket, that can be proven with a compression check. Don’t keep running this car with the overheating problem, you’ll ruin the ICE.

 

Fan not running when overheating means either temp sensor is bad, or the fan itself is defective, at least when the temperature rises too much

 

Or the relay controlling the fan

 

apparently the fan IS working/

 

"the fans not working when car overheating"

 

how can the fan work at 95° & then NOT work when the car is overheating?
or let's say it like this: how can the car overheat when the fan kicks in at 95°?
the temperature IN the radiator has to be ok, so the flow of the 95° fluid to the sensor has to be interrupted/blocked somewhere/
after you changed pretty much the majority of the cooling system components, from my pov it funnels down to what @4est already said:

 

Mine is acting the same. Fans only work when engine is on even tho its overheated

 

How can the engine cooling be overheated when the ICE is not on ????? What is the temp of the engine coolant at that point.???

I would dispose of all coolant, flush with water to assure good flow, refill with new coolant. You have a 2005 so I know that one. Check vacuum bottle by left wheel, drain also. BLEED all air out of all systems. Make sure
car heater is working! The car is 13 years old, will need, has needed constant maintenance.

 

I also have a 2010. The 2010 is the one I have this problem with

 

240 f

 

240f ??????? Is this a new language ?

 

I’m guessing that’s 240 degreesF, Way too hot. Temps on Prius usually run under 100 degrees.

 

Yes it starts out around 150ish and gets to 240 250 degrees F

 

Too hot. A blockage? On a normal car I would say “ the thermostat for Ice cooling is not working OR
wrong range.

 

Should start out at ambient

 

Remove the thermostat and see what happens.

 

... Celsius. Thermostat opens around 85 C, maybe 90 C in later models, fans start if it hits 95 C.

... that's about 185, 194, 203 if you live in Fahrenheit-land. Yes, 240 F is still darned hot.

I find the Celsius figures easier to remember, as they're nice round numbers, making it pretty clear the Japanese engineers were thinking in Celsius when they picked 'em.

Just to avoid any confusion, the inverter cooling system is not any part of the cooling system for the engine. Those two systems are entirely separate and unconnected.

-Chap

 

Mis-spoke, you are correct.

 

Normal temp is 190 degrees F to 197 degrees F. Anything above, you got a problem.