2010 Prius Overheating issue fixed

Well it was a 2010 Asian plastic impellered electric water pump just with the age of the vehicle it's X amount of years old doesn't worry me too much probably should have failed If you would have taken the four bolts or the two or three bolts on the other side of the water pump and pull that cover off you could have pulled the impeller out and seen what you were feeling I've taken pictures but they're too hard to post here from a pump I did a while ago it seems pretty common actually especially once they overheat or get really hot a couple of times I guess this plastic can just lift off the impeller It's wrapped around the metal I guess it's to keep it smooth and spinning freely when it's working properly but once it gets overheated and cracks then it keeps the impeller from spinning and it's bore and you have overheating quite normal actually I would think you might want to get a new thermostat just because I don't know how old the old one is as in mileage or time or years thermostats are very inexpensive as parts go or if you start to overheat your car again your new water pump will do the same thing. Good luck

 

The Asian brand is the original maker of the pump so if that's what you bought online that should be the original factory the ones that don't do so well are made by the same factory people seem to think but when you look at the cover the silver part you can clearly see the Asian word has been ground off maybe that's done during quality control ones that don't pass get that name ground off get thrown in a bucket some other company buys all those and does I don't know what with them sells them on eBay an electric water pump should not pose such a threat and a failure rate problem it is a pretty simple device My big bore Italian scooters have had them for a quarter century almost so I don't see what the problem is most of these actually that I've seen fail have well over 100,000 miles on them by most accounts that's generally life.

 

you are better off with the oem, there have been a lot of bad fake water pumps and other parts

 

I do not think your thermostat was failing. If it was failing, you would still have the problem since you did not replace it. Your problem with the engine overheating was caused by the water pump impeller not being able to rotate freely. The impeller sticks and does not rotate at the required speed to move the coolant to cool the engine.

The coolant should be replaced at 100k miles/10 years and then 50k miles/5 years thereafter. Maybe the coolant was not replaced at 100k and 150k miles.

Please report back on this thread 1 and 2 years from now, and let us know how the Aisin water pump is holding up.

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Just my impressions from what I’ve read here: Toyota’s water pump is made by Aisin, and genuine Aisin (WPT-190) is equivalent, same quality.

 

I've even seen people here go as far as to say they received Aisin pumps where a Toyota logo was part of the casting mold, and then ground off of the pump.

Not all of those threads go on to consider on what basis Aisin might decide which of those pumps to sell to Toyota, and which ones to grind the logos off of and sell in other channels.

 

Or someone makes a fake Aisin, and grind a little (blank) zone where Toyota logo would be?