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Noisy power steering, elementary questions

Jimmy2007 Nov 23, 2020

  1. Jimmy2007

    Jimmy2007 Registered User

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    Hi everyone, Audi A6 C6 4F 2008 3.0l quattro, all of a sudden, after a cold night i got this little noise when stationary and moving the wheels.
    It's the same noise you get when on full lock, but this is present even by slightly turning the wheels.
    Also the revs go down a tiny touch (but noticeably) when doing that.
    I had a look at the reservoir and it was on min, so i topped it up and followed the bleed procedure.
    Much better, but noise still there.
    So reading about this problem, it appears that the hoses' clamps are not the best and can let air in the system.
    Now, i can see the 2 hoses going into the reservoir and the clamps (totally dry) but, and excuse me for the silly question, where's the PS pump?
    A picture would be great.

    Also, when I bought the car a couple of years ago I enquired about cam belt change and I was told my car hasn't got one, but a chain and having only 50k miles I shouldn't do anything to it.
    Could anyone confirm this please?

    Thanks
     
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  3. abmat

    abmat Active Member VCDS Map User

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    AFAIK chain at the back, belt at the front to drive fuel pump.
     
  4. Jimmy2007

    Jimmy2007 Registered User

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    Anyone willing to chip in regarding the noise when turning wheels please?
     
  5. abmat

    abmat Active Member VCDS Map User

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    Shot in the dark, could be the pump failing.
     
  6. Jimmy2007

    Jimmy2007 Registered User

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    Thanks, is there a way to test the pump before throwing money away?
    Also, any guidance on how to replace the hose clamps?
    From the top it looks like the pump is at the bottom passenger side, correct?
     
  7. abmat

    abmat Active Member VCDS Map User

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    I’m afraid I’m out on this one. Only offering possible causes.

    perhaps @B5NUT might be able to help. He’s done quite a bit on the A6
     
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  8. B5NUT

    B5NUT Well-Known Member VCDS Map User

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    When was the last time the fluid was ever changed?
     
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  9. Jimmy2007

    Jimmy2007 Registered User

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    Never changed, just clocked 50k and planned to do at next service.
    Do you reckon it needs changing urgently?
     
  10. B5NUT

    B5NUT Well-Known Member VCDS Map User

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    Before you chuck good money at a pump I would make sure the PAS fluid is ok first, the car may only have 50K miles but the fluid is almost 14 years old, and most likely well passed it's best.

    It's any easy change as well. Drain the reservoir and disconnect the return pipe and push that into a container. Block off the return on the reservoir and fill with new fluid. Get some to start the engine and allow the pump to to fill the container with the old fluid, keeping the reservoir topped up. Once the you can see clean fluid coming through then stop the engine and refit the pipe, then top up the fluid.

    I would also check for leaks around the rack as the missing fluid has gone somewhere.
     
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  11. Jimmy2007

    Jimmy2007 Registered User

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    Will do, thanks.
    One thing I'm unclear, once i start the engine, do i need to turn wheels or will it just pump fluid on its own?
    Also, which one is the return pipe, top or bottom?
     
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  13. B5NUT

    B5NUT Well-Known Member VCDS Map User

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    You could do it won't cause any harm. The main point is not to let the reservoir run dry as you will end up with a lot of air in the system which will make the pump even more noisy!
     
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  14. Jimmy2007

    Jimmy2007 Registered User

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    Ok, thanks.
    I suppose the return pipe is the one at bottom with the fishnet sleeve.
    Correct?
    My reservoir looks like the on in the picture attached.
    Is there a way to check for sure which one is the return pipe?
    Thanks Screenshot_20201125-184036_Samsung Internet.jpg
     
  15. B5NUT

    B5NUT Well-Known Member VCDS Map User

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    I cannot remember the feed pipe should be going to the pump, the return should be coming from the cooler mounted in front of the radiator.
     
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  16. abmat

    abmat Active Member VCDS Map User

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    Logic would say the pipe with the smaller bore is the feed as it is at a higher pressure than the return? Or am I talking sh!t£
     
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  17. Jimmy2007

    Jimmy2007 Registered User

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    Ok, thanks.
    I'll check it out and if I can't work it out I take some pictures.
    It's very cramped in there.
     
  18. Jimmy2007

    Jimmy2007 Registered User

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    Accordingly to this scheme the return should be the smaller hose fitted at the top of the reservoir (10).
    The bottom larger hose (3) is listed as the feed.
    Correct?
    I just wanna say thank you for your help.
    I really appreciate it.

    Please copy and paste all of the following, otherwise it doesn't work.

    https://7zap.com/en/catalog/cars/Audi/brand/3/0/Audi A6/Audi A6 (2008 - 2011)/Audi/UThlN2dLaU1hSllPUnpQNHMrNnZNQT09--/6bbffde8b5b8077d2d0a5796da6eea3c:7477da17ddd2975b3a9c557ba32c9f58/manufacturer/4/448422600::422060
     
  19. B5NUT

    B5NUT Well-Known Member VCDS Map User

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    It would make sense the larger dimeter pipe is the feed, You could also disconnect at point 25 in that drawing, it's whatever is easiest to access.
     
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  20. Jimmy2007

    Jimmy2007 Registered User

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    Thanks, I'll see if I can attack this job asap and let you know.
    Last question if you don't mind:
    The cap on the reservoir says use only G002000 oil.
    Is febi 06161 the correct fluid?
    I used it in my Passat.
    2 litres enough?

    Thanks
     
  21. Jimmy2007

    Jimmy2007 Registered User

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  22. B5NUT

    B5NUT Well-Known Member VCDS Map User

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    Sorry on the oil front I could not tell you, I get all my fluids from TPS, so it's either the genuine VAG stuff or the VW quantum range. 2 litres would be more than enough to flush the PAS system.
     
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  23. Jimmy2007

    Jimmy2007 Registered User

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    Nice one.
    Thanks.

    BTW, are you called B5NUT because you like B5s?
    My other car is a Passat B5 1.8T 150bhp, I call her "My Lady Beast":thumbs up:
     
  24. B5NUT

    B5NUT Well-Known Member VCDS Map User

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    Yes, and I still have my first B5 I purchased over 20 years ago, which is near the end of it's restoration.
     
  25. Jimmy2007

    Jimmy2007 Registered User

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    Nice one.
    Are you on the ukpassat forum?
    I'm there
     
  26. B5NUT

    B5NUT Well-Known Member VCDS Map User

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  27. Jimmy2007

    Jimmy2007 Registered User

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    Ah, ok.
    I have the B5 of the poor, although I love it.
     

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