Prius Gen3 2011 Heatup Issues in Hilly Areas

What specifically are your "heatup issues"?

 

welcome!
how many km on her?
does she burn any oil?
have you cleaned the egr circuit?

 

Any warning lights? OR just radiator fan running more often?

Having air in the cooling system can cause this problem.

Also a clogged EGR valve can be a contributing problem...

 

must get the car scanned for error codes first

 

How long have you had the car?

have you checked the radiator condition?
mine did the same and it was due to a clogged radiator
because the previous owner used plain water instead of coolant in the ICE reservoir i don't know for how long

 

sometimes on an engine replacement, the egr circuit is ignored.

maybe the coolant wasn't bled properly

 

If I understand correctly, you have a problem with overheating under load (i.e. going up long hills) and have replaced the engine, coolant, and radiator.

Have you replaced the thermostat? Have you replaced the water pump? Are you losing coolant? If you turn the heater on, does the car blow warm air steadily from the vents or does it sometimes blow hot air and sometimes lukewarm air?

Have you used any "stop leak" type products in the past?

 

I would verify through a scanner what the temperature reads when you get the warning light. A picture of the warning light would help. Some have confused another light for the temperature warning.

 

You can still run the heater when it is 40-50 degrees C. It won't be pleasant (even with the windows down), but it is just a simple diagnostic test to see if there is air in the cooling system. If there is air in the lines, the heater will blow really hot sometimes and then suddenly blow cool(er) air even though you did not change the settings.

 

It seems that the electric water pump & radiator fans are original? There's also a chance you installed a counterfeit part that is actually bad/defective.

I'm going to assume that all the parts you installed are good and working properly. Check your radiator fans to see if they are functioning. Check your water pump. Dirt or debris from all the previous work could've gotten in the cooling system and is intermittently jamming up the plastic components of the water pump.

Good Luck....

 

purging all the air out of the system