Coolant Transfer Noise...FIXED!

[BitShifter01]

Hello,

For over a year the coolant pump in my Prius has made that interesting noise when you power it on/off in cold weather.

See this thread here.
Noise on start up

Well I recorded the noise and took it into the dealer to have them take a look at it. Even after watching the video they were a little reluctant to fix it. they wanted to leave the car overnight so they could power it on and hear the noise themselves.

After a day they decided to replace the part under warranty. Since it has been replaced the only noise I hear is the standard pump running. According to them, there are two pumps, one for drawing fluid out of the thermos, and one for putting it back. Can someone tell me if this is true? I think they are just feeding me a line. The first time I went to pick up the car it still made the same noise, even though they said it was fixed. They then took it back in and replaced the 'other' pump and the noise went away. My mother and Grandfather both have Prii. My mom's 2007 Prius makes the same noise, but my grandfather's does not.

I figured I would just spread the word to let you know it IS possible to get this pump replaced, as most of you know from reading other posts. It took me just a little persistence but it was finally replaced.

Regards,
BitShifter01

[Patrick Wong]

No - there is only one coolant heat recovery pump, along with a rotary valve setup that allows the correct flow of fluid in and out of the thermos container as controlled by the engine ECU.

Glad that you got the pump replaced under warranty.

[Rest]

We have a 2006 and 2007 Prius. One makes the weird pump noise after shutting it down and the other doesn't. I am going to have to learn more about this now

[JimboK]

Galaxee recently posted that Toyota has now issued a TSB for it and it can be fixed under the power train warranty.