Knocking Sound, AC System?

Discussion in 'LR4' started by vlonjati, Jul 9, 2018.

  1. vlonjati

    vlonjati Active Member

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    Hi all, I just noticed something that now that is hot was a bit easier to pinpoint. I say pinpoint but am looking for the group wisdom.

    I hear a knocking sound that diminishes when the AC is turned on. I think it is louder with it off though.
    Facing the engine I hear it coming from the right side of the engine. Could it be my air compressor failing?

    My car MY10 LR4 has had the timing guides, chain tensioner replaced. I am sure that is not where the sound is generated.

    Thank in advance for your insight.
     
  2. ktm525

    ktm525 Full Access Member

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    fan clutch?
     
  3. vlonjati

    vlonjati Active Member

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    ktm525, it might be... my fan clutch was making clicking noise this winter. I did not think that its issue could exhibit also as a knocking. I think I need to fix the fan first and rule that out.
     
  4. ktm525

    ktm525 Full Access Member

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    Ok if you know the clock cadence ticking of the clutch fan then that is not it. Deep knock? Can you record it?
     
  5. ryanjl

    ryanjl Full Access Member

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    Yeah, to me, the clutch fan sounds more like a "tink, tink, tink" and less of a knock, if that makes sense. At least in my experience.

    It could be either a compressor or one of the belt pulleys going out.

    Does it sound external to the engine or internal?
     
  6. vlonjati

    vlonjati Active Member

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    The "knock" sounds deep, like knocking on a table ... I cannot say it is external or internal... I can't make it out.
    I also have heard and had the "tink, tink, tink" from the Fan.
    I will try to record a sample of it.
     

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