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noise

Discussion in 'Gen 2 Prius Main Forum' started by chuckyjean, Nov 27, 2010.

  1. chuckyjean

    chuckyjean New Member

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    Location:
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    Vehicle:
    2005 Prius
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    What is that noise the Prius makes after it is shut down? I'm sure it is suppose to do what it is suppose to do, I'm just curious what the noise is. Thanks.
     
    #1 chuckyjean, Nov 27, 2010
  2. Hal W

    Hal W New Member

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    Model:
    II
    I believe its the inverter cooling pump your hearing. Err err err. H
     
    #2 Hal W, Nov 27, 2010
  3. Patrick Wong

    Patrick Wong DIY Enthusiast

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    Two
    You are probably hearing the coolant heat recovery pump. It runs for several seconds upon cold engine startup and frequently also runs upon shutdown.

    The pump is moving coolant to and from the coolant heat recovery system canister, which stores ~3 liters of hot engine coolant. The idea is to speed up cold engine startup to reduce exhaust emissions during engine warmup.
     
    #3 Patrick Wong, Nov 27, 2010
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