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nasty metalic rattle

Discussion in 'Land Rover Freelander' started by longy44, May 25, 2016.

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  1. longy44

    longy44 Member

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    hi guys,stood on the drive today with engine running fiddling with the heating knobs and i turned the heating fan on then turned first knob to demist and got a really nasty metallic grinding noise,has any of you got any idea what would cause this.i have listened under bonnet and it appears to come from belt area on engine,but it only does it when demist is selected.any help gratefully excepted.
     
  2. hd3

    hd3 Well-Known Member Full Member

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    does it have air con. ?
     
  3. longy44

    longy44 Member

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    yes it does have aircon,i did not turn that on though when it made this noise.
     
  4. hd3

    hd3 Well-Known Member Full Member

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    air con is 'on' when demist or demist+footwell is selected
    ( there's a microswitch on the air-route selection dial )
    regardless of the AC dash switch position

    so 'noise' will have something to do with the aux. belts pulley system
    and / or the ac compressor
    the crankshaft one is known to come apart with age .. and makes 'orrible noises
    then there's a belt tensioner that gets mentioned as a noise source

    someone else with detailed knowledge of the belt-pulley system might give more info

    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
     
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  5. freelance

    freelance Well-Known Member

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    Most likely the crankshaft pulley needs replacing, the damper gradually gives up,
     
  6. Nodge68

    Nodge68 Well-Known Member

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    +1
     
  7. longy44

    longy44 Member

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    jf it was the crankshaft pulley you would have noise all the time,this only makes a noise when demist operated.
     
  8. Nodge68

    Nodge68 Well-Known Member

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    It's making the noise on demist because of the added load imposed by the AC pump. I suppose it could be the AC pump itself causing the the noise, but the pulley is a known failure item.
     
  9. GrumpyGel

    GrumpyGel Well-Known Member Full Member

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    Shine a torch at the pulley and see if there's any sparkling dust around it.

    These pulleys have been known to make noises under varying conditions when they start to fail.
     
  10. longy44

    longy44 Member

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    ok will have a good look round pulleys and air-con pump see if i can see anything,will have to be tomorrow now.
     
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