VERY loud rattle, abruptly vanished, now temperature warnings?

It's probably misfiring and rattling the planetary gearset. You need to scan it and get fault codes before jumping to conclusions

 

Take it to your local auto parts store and get the OBD code read for free. Google the code with the word "Prius" and post back as needed.

 

How many miles on the car.

Have you checked the oil and the engine coolant level?

 

The noise could have been a bad water pump and it or the serpentine belt may have failed completely.
I would look to see if the belt is still present.

 

That code does not exist for your car according to Toyota......

Just trying to help

As somebody who owns a Prius repair shop, my replies might sometimes be short but I'm trying to help the people on this board get accurate information. A "conclusion" is something that I would reach after having some evidence and data. A "suggestion" is just that. Best of luck to you in getting your car fixed.

In the professional world we would want to see a freeze frame from techstream with the code, information code if there is one, and then we have some data to work with.

 

Sadly, what you have is insufficient. As previously stated, P0111 is not a valid Prius DTC. So that is not going to help you. If you want to DIY you might want to invest in Mini VCI.

It sounds like your car has at least two issues:

Overheating:
1. check the inverter coolant reservoir for turbulence when the Prius is READY, which would show the inverter pump is running
2. check the engine radiator fluid level in the radiator itself. This means removing the black plastic cover over the radiator for access to the radiator cap. Do not rely upon looking just at the overflow container behind the radiator.
3. Inspect all coolant hoses and the radiator, looking for signs of a leak. Look at the engine coolant pump bearing, for signs of antifreeze leaking. You may just see a whitish or pinkish powdery stain. If you can smell coolant then there is a leak somewhere.

Engine noise which went away: First figure out why the car is overheating and resolve that. Then see how the engine performs.

 

A failed inverter coolant pump has nothing to do with intake air temp.

A failed inverter coolant pump does not make you smell coolant. You had a mecahanic look at the car
And he says timing chain is making the rattle.

I think you have 2 issues. The engine coolant radiator is probably empty because the engine water pump is blown and leaking or the belt fell off and you overheated the motor and probably spun a piston bearing and the inverter coolant pump is probably blown and hell lets throw the hybrid battery is bad too in there.

 

It's not a serpentine belt it's a regular old belt like used for fans. Fan belt.

The engine bay must have stunk of coolant as it was leaking profusely out of the Pump and probably hosed down the front of the engine. It would have smelled in the car too. I am pretty sure the whole front of the car from the outside probably stunk.

That would have surely tipped you off when you checked the oil but I suspect you just blew me off when I asked about the oil level.

Pay attention to smells in a car they will give you warning of impending doom.

 

I see absolutely no reason to make that distinction. The Prius service manual calls it a "drive belt" if you really want to get picky, but everyone and their mom knew what Quantum Cat was talking about. Fan belt/serpentine belt/alternator belt/etc. technically mean different things, but are used interchangeably almost universally. Fan belt is just a bit antiquated. In this case, "serpentine" would be more appropriate than "fan."

I don't know what problems you have in life, but this is a direct quote from earlier in the thread...

Quantum Cat literally responded to you directly and acknowledged that he accepted your advice and followed through on checking the oil level. I'm not sure what else you think needed to be done.

 

My point **** was if Cat had actually opened the hood he or she would have seen and smelled a lot of coolant all over the front of the engine alerting them that the engine water pump had exploded. Coolant stinks even you could detect it.

And there's a big difference between a serpentine belt and a v belt.
Sorry you have no clue about belts there not interchangable, Serpentine is a completely different belt than a v belt and require completely different pulleys. Clueless.

And still waiting for your list of posters that say a hybrid charger will damage the battery or not help at all.

 

Insults aside, you're still wrong on your belt discussion.

I agree that there's a difference between a serpentine belt and v belt. The belt for the water pump on a Prius is a poly-v (also commonly referred to as serpentine, but the most accurate term for this belt would technically be "drive belt"). It is not a v belt, and I never said anything about v belts, so I'm not really sure why you brought them up, unless you're thinking the belt in question IS a v belt, in which case you're just compounding your incorrect notions. To be honest, it seems like you're confused over which belt we're talking about here and/or you're an old timer mixing up terminology (v belts and fan belts aren't very common any longer).

 

I call the belt a "serpentine" belt. More importantly, Toyota's parts catalog does as well.


The Toyota factory repair manual calls it a V-ribbed belt. However, the repair manual also mentions a fan and generator, and we all know that the belt actually powers neither a fan nor a generator.


I hope we can put that aside and move on.