Vehicle: 2010 Prius 166k About a 6 days ago I was getting the overheating symbol and a check Engine light with code p0117, and I was low on coolant. , I of course immediately stopped the vehicle on the shoulder and let it cool down. Replaced the thermostat and ECT sensor and replaced the coolant with fresh Asian vehicle red coolant. First crank I inspected the exhaust to see any white smoke. None. That seemed to fix the issue, I put around 500 miles on this baby 6 days 0 issues. Then I was driving about 60 on the high way and the overheat symbol popped for just a second and disappeared(no CEL), I immediately pulled over and popped the hood to inspect. I found that the coolant reservoir was full. After a day or so, I got my diagnostic tool to try and find the problem myself, i went on a cruise, low rpm for first 5 min no issues. I found that the AC did not get hot up until the engine had reached 225 while stopped on the shoulder of the freeway. I have ordered the Aisin water pump on Amazon and will keep you guys updated if that fixes the issue. If any of you guys can drop some advice I’d appreciate it.
Engine coolant temperature of 225F is too hot. It should normally stay below 200F, but sometimes it will rise to 202F with heavy engine usage like going up a steep hill or mountain. I agree that it is probably your engine water pump going bad. You are taking a big risk buying a cheap water pump because there have been many, many, many problems reported with them not working or only working for a short period of time. How much is your engine worth to you. An overheating engine can lead to head gasket failure. I know that the OEM water pump is expensive, but l would do the repair right the first time, and not have to do it a second time. Posted via the PriusChat mobile app.
Are the Aisin Toyota water pumps not good quality($160)Most reviews and videos they seem to be using that exact one with the Toyota symbol scratched off
If it did have a stop leak product I’d have no clue but I did replace coolant very recently, EGR has never been cleaned in the time that I’ve owned it. Other than that, I change the oil every 3k miles and take care of my cars, guess I’ve just gotten unlucky with this one. Hopefully I can fix it and get 50k more miles out of it
Well if you are going to replace the water pump while you are down you gould clean the EGR and intake manifold. Replace the PCV valve at the same time. Olathe Toyota has good prices on OEM and they ship.
Did you read the negative reviews on Amazon for the Asin pump that you bought? You only have a 30-day return window after purchase to return it if you have problems. If you have problems after 31 days, you just lost your $160. I hope that you do not have any problems with the pump you bought. Please come back in 2 years and let us know how it worked out. Posted via the PriusChat mobile app.
The OP replaced his water pump. Details are in a new thread that he started here 2010 Prius Overheating issue fixed | PriusChat
