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2005 Prius Mystery Noise

Discussion in 'Gen 2 Prius Technical Discussion' started by Houston, Jul 31, 2010.

  1. Houston

    Houston New Member

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    on startup my 2005 Prius standard produces a low level cyclic noise which sounds like a hacksaw. This noise lasts for several minutes and is not affected by putting the car in motion or leaving it parked. The noise seems to be coming from the Synergy Unit but who knows? Any suggestions??
     
  2. northwichita

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    [QUOTE=Houston;1159014]on startup my 2005 Prius standard produces a low level cyclic noise which sounds like a hacksaw. This noise lasts for several minutes and is not affected by putting the car in motion or leaving it parked. The noise seems to be coming from the Synergy Unit but who knows? Any suggestions??[/QUOTE]

    I would first check out the electrical powered coolant pumps near the driver's side headlight, remove the plastic engine cover and try to feel/listen to exactly where the noise is coming from.
     
  3. Houston

    Houston New Member

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    I would first check out the electrical powered coolant pumps near the driver's side headlight, remove the plastic engine cover and try to feel/listen to exactly where the noise is coming from.[/QUOTE]
     
  4. Houston

    Houston New Member

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    Thank you for your suggestion. I removed the cover and used a stethoscope but couldn't
    pin down a location. As usual, as I was about to check another area, the noise quit and probably wont reoccur again for a day or so!! I will check the other pumps then.
     
  5. Houston

    Houston New Member

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    [/QUOTE]


    RE my last post---I tried again and the sawing noise is coming from the pump[?] unit directly behind the left headlamp. Can you tell me what this unit is and should I worry???
     
  6. vertex

    vertex Active Member

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  7. northwichita

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    RE my last post---I tried again and the sawing noise is coming from the pump[?] unit directly behind the left headlamp. Can you tell me what this unit is and should I worry???[/QUOTE]

    Sounds like the inverter coolant pump, very important especially in hot weather with a/c use, sounds like yours should be replaced.

    http://priuschat.com/forums/gen-ii-...g/36513-inverter-coolant-pump-takes-dive.html

    Here is one link to a priuschat discussion, 13 pages worth, I don't want to try to summarize.

    Also how to replace with some photo's
    http://priuschat.com/forums/gen-ii-.../65173-how-replace-inverter-coolant-pump.html
     
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