Prius makes noise (video included)

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by b100, Jan 17, 2017.

  1. b100

    b100 Member

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    Hello people!

    I'm always trying too help people out here but now i have a problem, and i do t know exactly where its coming from.
    My 2006 with 217.000 km (135k miles) is making a strange noise when accelerating with 1/4 gas.
    Or when i rev the engine up to 3000rpm.
    In the video i rev it up to 3000rpm in Park mode.
    I think its may the water pump or waterpumppully.
    When engine is cold its also way more noisy. In the video the engine is warm (40km trip).
    In electric mode there is no noise so its the engine for sure.
    Thanks for reading.

     
  2. Fred_H

    Fred_H Misoversimplifier

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    Hi b100,
    To me, it also sounds very much like a worn out or defective bearing. I also think it is probably the bearing of the idler pulley or the water pump.

    I would suggest removing the belt when the engine is cold. Then you can run the engine for a minute or two with little danger of overheating.

    You can find some good advice about removing and installing the belt here on PriusChat. Try entering this into Google:
    Code:
      site:priuschat.com change belt  
    When the belt is removed, and if then the sound goes away, you might be able to determine which bearing is bad by turning and wiggling the pulleys by hand.

    -----

    Even if that is not the cause of the noise, if the belt and idler pulley have never been replaced, now would be a good time to replace them.
     
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  3. b100

    b100 Member

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    Yes thats what i thought to. I ordered a pully, pump and belt. Going to change them anyway because they never been replaced. Also picked Toyota SLLC by the dealer. Going to do the engine and inverter.
     
  4. edthefox5

    edthefox5 Senior Member

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    You can put the car in inspection and listen to the engine. Engine will run continuously for manual inspection.
    YouTube Prius inspection mode.
     
  5. edthefox5

    edthefox5 Senior Member

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    After u install the belt don't tighten it up to much. Put the car in inspection mode and let it run for a while to break the belt in and loosen it up.
    Then do final tighten.
    Hope u have a scan gauge to check engine temp after coolant change as bleeding the air out of the coolant system is hard. You must cycle the CHRS
    pump as air will get trapped there. Easy to overheat the car with trapped air
    In the head. Aluminum head.
     
  6. Fred_H

    Fred_H Misoversimplifier

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    That's right, it is important to get all the air out. However, the European Gen II Prius does not have the heat storage system with the thermos tank and coolant flow control valve, so it is a little bit easier. Nevertheless, it still does take some patience, several times stopping, refilling and revving to get all the air out.
     
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  7. b100

    b100 Member

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    Yeah, maybe run the heatercorepump to? it will help the proces
     
  8. andrewclaus

    andrewclaus Active Member

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    No, that's not needed. The engine's mechanical water pump will circulate coolant through the heater core. It may not fill the CHRS loop though, so you need to run that pump. You also need to bleed the top of radiator using a 6mm hex key in the bleeder valve.
     
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  9. b100

    b100 Member

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    I dont have a CHRS.
     
  10. andrewclaus

    andrewclaus Active Member

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    If I'd read post #6, I would have seen that! In any case, use the bleeder valve and a piece of tubing back to the radiator cap--that helps a lot.
     
  11. b100

    b100 Member

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    Update!


    Yesterday changed the waterump and waterpumppully. Filled up with SLLC and sound is gone! Yes me happy.
    But during the job a had some trouble and questions.
    My prius doesn't have a heat storage tank.
    First i tried to drain off course, loosen the radiatorcap and then loosen the yellow drain plug on the back of the radiator. But only about 1,5liter was coming out. Then opened the engine coolant drain on the back off the engine. Maybe 1 liter coming out.
    Then i thought mmmm ok I'm just pulling the waterpump and see how much is coming out.
    I think about 2 liters. So total approximately 4,5 liters.
    But the internet says that there must me more then 8 liters inside the engine alone. Where was the rest. Did i miss something?
    But i filled it after replacing the pump. At least i was trying to fill....omg the coolant wouldn't go in the radiator. Searched on the internet. There was a bold on the left side of the radiator, when you loosing that up it will go inside. Omg how i suppose to know that:p
    After filling about 4,5liter new coolant back. Run the engine for a while. No air was coming out and the car runs great. Level is oke now.
    IMG_5297.JPG
     
  12. valde3

    valde3 Senior Member

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    I can’t remember the exact amount of coolant but that sounds pretty much right. Coolant thermos has to have a lot of coolant in it to be useful. I think the user manual has the amount of coolant mentioned in it. Some coolant will be left in the heater core and you really can’t do anything about it.

    I think there was sticker on radiator support about the radiator air bleed srew.
     
    #12 valde3, Jan 24, 2017
    Last edited: Jan 24, 2017
  13. andrewclaus

    andrewclaus Active Member

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    There is another engine drain, but that usually only drains another 1/2 liter or so. Failure to completely drain the system is one reason Toyota recommends a shorter interval for the next coolant change--50K miles in the US, instead of 100K miles.

    See posts #8 and #10 about the radiator bleeder valve. We did try to tell you. Check your level daily in the coming week, at the radiator cap. You may need to add a few ccs.
     
  14. b100

    b100 Member

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    Yes your right, you guys told me but i just forgot it. Thanks for the advice. I will check the level for sure.
     
  15. Fred_H

    Fred_H Misoversimplifier

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    According to my German owner's manual, the cooling system capacity for the European Prius without the heat storage tank is 5.5 liters for the engine, and 2.7 liters for the inverter.
    (For right hand steering cars 5.3 liters for the engine coolant)

    According to the N American shop manual, the Prius with the heat storage tank has an engine coolant capacity of 8.6 liters.

    So you replaced about 80%, and that's good enough. The important thing is that you have some fresh stuff in there for the next 100k.
     
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  16. Fred_H

    Fred_H Misoversimplifier

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    Here is a small excerpt from the Prius shop manual about replacing the inverter coolant:

    [​IMG]

    I also recommend that you make sure you have a proper size tube for bleeding air, before you begin draining the inverter coolant. I used a 6 mm inside diameter transparent tube, about 80cm long.
     
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  17. franken1313

    franken1313 Member

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  18. franken1313

    franken1313 Member

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  19. dolj

    dolj Senior Member

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    Coolant Heat Recovery System.
     
  20. fotomoto

    fotomoto Senior Member

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    AKA The thermos bottle system. After turning off the car, it can be heard pumping hot coolant (that sounds funny) into the thermos bottle to aid a more rapid warmup of the ICE on the next restart.
     
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