Coolant thermo bottle pump not working?

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by 2009Prius, Dec 8, 2009.

  1. 2009Prius

    2009Prius A Wimpy DIYer

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    I haven't heard the coolant thermo bottle pump running after shutting down the car in the last few days. How do I check to be sure if there is a problem or not? Thanks!
     
    #1 2009Prius, Dec 8, 2009
  2. dogfriend

    dogfriend Human - Animal Hybrid

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    If you have a Scangauge, you can monitor coolant temp to see if it rises when you first boot up in the morning.

    If not, the best way is to hear it, I would lower the window (use IG-On to lower window before going to Ready) then listen for it.

    Finally, if it isn't working, theoretically it should set code(s) and warnings.
     
    #2 dogfriend, Dec 8, 2009
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  3. qbee42

    qbee42 My other car is a boat

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    Also remember that the thermos is not always used. If the temperature levels are such that it doesn't make sense, the pump will not activate.

    Tom
     
    #3 qbee42, Dec 8, 2009
  4. 2009Prius

    2009Prius A Wimpy DIYer

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    Did you mean if the coolant is not hot enough?
     
    #4 2009Prius, Dec 8, 2009
  5. qbee42

    qbee42 My other car is a boat

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    Right. The control system looks at the coolant temperature in the thermos and in the engine. It only pumps the coolant if it makes sense.

    Tom
     
    #5 qbee42, Dec 8, 2009
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  6. vertex

    vertex Active Member

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    If the pump is not working the CEL will light, and you will get DTC PA2601.
     
    #6 vertex, Dec 8, 2009
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  7. 2009Prius

    2009Prius A Wimpy DIYer

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    I have been checking the ScanGauge whenever I remember to do so. Almost every time the pump seems working fine. It still puzzles me that sometimes the sound is loud and clear as it used to be when I first bought the car new but sometimes I just don't hear anything. The loud and clear noise used to happen every time when the car is shut down. It is similar to the http://jaygroh.dreamhost.com/priuschat/coolantnoise3.wav below but mine is higher in pitch and without the clicking sound in the middle of the recording.
    I just went through this thread
    http://priuschat.com/forums/toyota-...-you-have-squeaky-chs-water-pump-new-tsb.html
    Not sure if it's related.
     
    #7 2009Prius, Jan 6, 2010
  8. dogfriend

    dogfriend Human - Animal Hybrid

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    #8 dogfriend, Jan 6, 2010
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