Water Pump Replacement

[Patrick Wong]

Originally Posted by EZW1

...
7. REMOVE WATER PUMP PULLEY

(a) Using SST, hold the pump pulley.

Regarding step 7(a), I suggest that it would be better to loosen the water pulley bolts while the serpentine belt is still installed, in lieu of having the SST available.

Originally Posted by Mike Dimmick

There are actually four water pumps on the car: three for the engine coolant, one for the inverter coolant. Of the three in the engine loop, one is mechanical and drives the coolant when the engine is running, the other two are electrical. One of those moves hot coolant through the heater core when the engine is off and heat is demanded, and the other pumps stored hot coolant from the thermos (heat storage tank) back to the engine to pre-heat it, before engine start...

True, so posters have to be precise about which pump they are referring to. It is interesting to note that the heater core pump doesn't receive much attention as a failed part.

I am wondering how many owners have failed pumps but don't realize it. The symptom would be insufficient heat coming from the heater system in the winter esp when the gasoline engine is not spinning. Of course, Prius is slow to provide heat even when everything is working as designed, so who would be able to determine that there's a problem...

[toyod]

Alldata gives the time to replace the water pump at 1.8 hours and the water pump at 92 dollars

[David Beale]

I don't understand the OP's question. $350 is cheap for car repair. Living under a rock?
We have dealers here who charge almost as much for an oil change and "checkup".

[BAllanJ]

Pssst...David.... He's talking in American dollars.