Engine overheating coolant spraying

could there be a clog somewhere? would an infrared thermometer help?

 

Winner, Winner, chicken dinner!!!!!! That Bar's head seal not only seals head gasket leaks; but they plug up any narrow passages (ie. radiator cooling, and heater coils). Did you replace the radiator when you dropped in the newer engine? Could some residual "stop-leak" have jammed up the thermostat? Check/feel the hoses for flow. What are the temperature sensors readings going to the cars CPU? I know the fan activation signal is way below 200 degrees.

 

The Prius this is happening on is a 2016, not a 2011, per your avatar?

 

Engine coolant passages are larger than radiator- or heater- coils. If the heater coil is blocked, there's a good chance your radiator is too - about the same size passages.
Your coolant thermostat probably isn't engaging the fans because of insignificant coolant flow - it doesn't see the true coolant temperature. An IR temperature gun would confirm. hit the 4 corners and center of the radiator; all temps should be the same. Any cold or hot spots is a clog.
Make sure your electric coolant pump is working. Also, if you car has an electronic coolant diverter valve - check functionality - it may be stuck diverting all coolant to the heater; not allowing any coolant to the radiator.

hope this helps

 

50/50 water/vinegar “may” dissolve your stop-leak product. One such product manufacturer recommends it. Test on a “chunk” if you can extract one, say from the reservoir. Some more thoughts on how to do such a flush, and return the system to a 50% coolant mix, in my signature.

 

Many years ago I purchased a radiator power flushing kit that was marketed by Prestone I believe. Came with a tiny jug of the flushing fluid, A water hose T fitting that hooked to a heater core line, and a spout to connect to the radiator neck to divert water away from the car. I was expecting the system to be very dirty and hooked everything up an tried it without the flush chemical first, Got some of the junk out but nothing like what came out after putting the flush chemical in. Each time you powered up the hose, there was lots of flow and lots of muddy water coming out until the thermostat would close. I would turn off the hose and wait till the engine came back up to temperature. After just a few cycles it was running clear water. I was very impressed with that system. I have never had such a neglected system since then but I also have not seen the flush and fill kit offered in a long time.
I would confirm that the sensor for the radiator fan is seeing the high coolant temps.

 

I think I still see those kits for sale at Walmart; though I would double check that chemical to see if it's safe for aluminum block engines.

I've also used them, 30 years ago, when I was too poor to repair a small hole in my radiator. Used that aluma-seal stuff and flush it out a few hundred miles later. Those old cars had much larger coolant passages, when compared to today's cars..

 

LoL; sometimes I get luck on internet diagnostic.

Time to buy a lottery ticket

 

What is bars head seal

 

Probably this.

Bar's Leaks HG-1 HEAD SEAL Blown Head Gasket Repair https://a.co/d/7Y1dxfR

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