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hard to say how common: 641294770 i don't think it is covered, but i think there is a tsb
If we are talking heat exchanger, that is present in gen 3 and 4. Gen 2 had a really loud coolant tank design.
has that been addressed in later gen 4 models
What were the initial symptoms of this heat exchanger issue? I wasn't aware this was a thing with the gen 4.
try the vin on toyota.com/owners there are a lot of little issues with gen 4, but the heat exchanger leak is the main one. now there is talk of...
As I said, a valve-gated refrigerant path through the battery pack. IIRC the only other dedicated component is an expansion valve. It uses the...
There's a TSB for a coolant leak into the heat exchanger but you may be outside of it by mileage. It effects some early gen 4 model years. There's...
The heat exchanger heats the coolant on startup to get the engine up to operating temperature as quickly as possible to allow earlier switching to...
Oh my!! They really are clueless, aren't they! The EGR system has nothing to do with the heat exchange system back at the catalytic converter...
Nothing other than a head gasket replacement just recently. During this job, I replaced the water pump, thermostat, spark plugs, coolant and...
Thanks for the reply. Could you please elaborate on which specific hoses you rerouted? Which heat exchanger - radiator or heater core or other?
I bet that it's going to be all of us, or at least up to 2022 models. It took them that long to recognize it as a recurring issue.
I wonder if it's there chiefly for an MPG benefit, or for an emissions benefit? It could also be both.... What's weird is, there's exactly such...
Why sort of mileage do these Gen 4 coolant leaks occur?
head gasket issue is just in the beginning stages. all we know is that there are a number of g4's with a leaky exhaust heat exchanger, that can...
We have to be careful with names in Gen 3 (and 4) because there are two different things we could mean by "exhaust cooler". Each one is a heat...
... which is pretty much what any Prius's HVAC "auto" mode will do: you'll notice the in-cabin blower being off at first, and gradually ramping up...
Thanks for the vote on head gasket. I seem to have hit the Jackpot as based on the coolant out of the exhaust it looked like a gen4 / steam engine...
As you can see, this front pipe is a boa constrictor swallowing three elephants. Starting from the left in the picture, the elephants are: (1)...
The obvious sign was the engine overheating light coming on and lack of heat through the vents (it was wintertime). The subtle sign that I ignored...
