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CHS Pump

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by jsorger, May 2, 2009.

  1. jsorger

    jsorger New Member

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    (Apologies - I inadvertently posted this in the TSB section):

    OK, so I've perused the 100+ postings about bad coolant pumps and still have a question. I'm at about 130k and my pump sound has recently changed (temperatures haven't changed much - I'm in N. CA). No bearing sounds or grinding like in the much-appreciated .wav files. Simply went up an octave or so. I have plenty of fluid.

    Anyone else? I assume it will fail soon, but I'm curious if anyone has experienced this (I'm way beyond warranty).

    Thanks,
    Jonathan
     
    #1 jsorger, May 2, 2009
  2. dogfriend

    dogfriend Human - Animal Hybrid

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    I haven't seen any posts where the pump actually failed. Mine makes the noise but I haven't had it replaced yet (I am still in warranty until Feb 2012 - its covered under the powertrain 5 yr - 60k). I monitor the coolant temp using a Scangauge.

    I would expect that if it actually fails to pump, you will get the Master Warning Light and it will set a code.
     
    #2 dogfriend, May 2, 2009
  3. Patrick Wong

    Patrick Wong DIY Enthusiast

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    Since this pump only runs for a few seconds upon startup and shutdown, and your car is out of warranty, no point in worrying about the noise - unless you have a check engine light come on to show that a DTC was logged.

    Even if the pump totally failed, this would not impact driveability. The only issue is that your car will emit slightly more HC during engine warmup.
     
    #3 Patrick Wong, May 2, 2009
    1 person likes this.
  4. jsorger

    jsorger New Member

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    That's what I was thinking from reading the other posts... Thanks for the replies, as always!
     
    #4 jsorger, May 4, 2009
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