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Noise after car shuts off is getting louder?

Discussion in 'Gen II Prius Care, Maintenance and Troubleshooting' started by BoostedTimmy, Jan 6, 2010.

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  1. BoostedTimmy

    BoostedTimmy Junior Member

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    Okay so whatever pump that still runs after the car is off is getting louder, sometimes it almost sounds like its running dry every couple of seconds. What fluid is this? How can I check it? Is this just typical with the <25 degree weather thats been here lately?

    My car has 104k on it, and my job requires my car...original inverter...this isnt the inverter going bad is it? I changed the trans fluid but havent done the inverter. I absolutely cannot get the red triangle right now!
  2. Bob64

    Bob64 Sapphire of the Blue Sky

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    Thats probably the coolant pump for the engine. It's storing hot coolant in the thermos. The fluid in question is probably the toyota super long life coolant (its pinkish).

    Even if it breaks, its not a huge problem. The car is still perfectly drivable. It just may have a harder time warming up and will impact your mpg a tad in the first 5 minutes or so.

    The inverter uses the same coolant, but that cooling loop is separate. Note: the inverter coolant pump is known to fail around your mileage (I THINK) - but it won't break the inverter - the inverter has heat protection that turns itself off to "limp home mode" until it cools down again..
  3. paprius4030

    paprius4030 My first Prius

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    The pump sometimes is louder in cold weather anyway, my 05 was especially loud in the winter.
  4. BoostedTimmy

    BoostedTimmy Junior Member

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    Thanks, I know I'm at the time when it usually fails :( If it can limp home its not a huge deal though so that's good to know....its probably just getting louder with winter right now though glad I'm not the only one.
  5. priuslovers

    priuslovers Way Out Member

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    I also have a 2005 with a little over 100k miles. In the morning when I first start the car (the car is garaged) I hear a funny whine noise (It kind of sounds like the cooling fan, but it is not). It only lasts a few seconds and then stops. Also when I come home from work and turn the car off I also hear the noise for a few seconds. Does anyone have any idea how to diagose this noise?

    Thank you, Priuslovers.
  6. mse103

    mse103 New Member

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    there is a TSB for the 2005 model at least where the noise does get louder in the cold weather, but toyota says the pump still works perfectly. If under warranty they will replace it with a newer less noisy model..... i was out of warranty when it occured, but decided not to replace it, as it wasnt 'broken' When the warm weather returns it returns to its more silent operation
    1 person likes this.
  7. 2009Prius

    2009Prius A Wimpy DIYer

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  8. richard schumacher

    richard schumacher shortbus driver

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    It's a warranty replacement item, but the design is, uhh, sub-optimal (only one end of the impeller shaft has a bearing), so they may be kind and allow you something on replacing it.
    1 person likes this.
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