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Knocking sound at idle & low coolant.

Discussion in 'Mk2 Leon FAQ's (1P) 2006-2012' started by bflare, Oct 27, 2018.

  1. bflare

    bflare Active Member

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    I have a 2.0 diesel seat Leon FR. I had the cam belt and water pump changed by a friend about 3 months ago. Not sure if the following are due to this. I noticed a relatively noisy ticking sound at idle. Once I increased the revs to 1000 it disappeared. I had a oil change done at the same time. I decided to put some more oil in today which was the proper VW approved oil & unless I am imagining it the ticking / knocking sound seems to have almost disappeared. Could this be down to the wrong oil been used at the oil change?

    Next issue. In the 5 years I've had the car I've hardly had to top up the coolant. This morning the warning light was on telling me the coolant was low. Seems a bit strange that this has happened a few months after the cam belt and water pump change. My friend did tell me to keep checking the water after he had done the work. Is there anything to worry about? Could this just be a coincidence?
     
  2. Legojon

    Legojon I only wanted a remap
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    Could have been cause the oil was low. Oil is oil really. As long as it's 5w30 or 5w40 I just mix and match what I have in the cupboard and none are vw spec. Hmm the coolant loss doesn't sound good. Top it back up but check it every day or every other day see if it's dropping again. Even new water pumps fail cause of the rubbish design. But also the seals can go.
     
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  3. Bedlam

    Bedlam Active Member

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    Gradual air lock release in coolant system?
     
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  4. bflare

    bflare Active Member

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    I have no idea what grade he put in to be honest. Just been out in it & the knocking is only there for maybe a minute on start up. Before I put oil in today the knocking was constantly there at idle.

    I will check the water daily & see if it drops.
     
  5. bflare

    bflare Active Member

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    You mean there could have been an airlock in the system when the pump was changed & it's made its way out?
     
  6. Bedlam

    Bedlam Active Member

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    Just a random thought, I am no mechanic !!!
     

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