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Thread: mystery coolant leak

  1. #1
    Regular Member Big Knox's Avatar
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    Default mystery coolant leak

    Chaps,

    Anyone know any tricks for finding coolant leaks? I have to keep topping mine up and yet I cant find where its getting out. There's no wet bit on the drive and no steam rises from the engine. I'm pretty sure its not the head gasket. The oil looks fine and coolant free. Its doing my head in.

    Cheers

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    Default

    Take off the header tank and check the back for a small crack. Few posts on this now. Dont worry only £19 or so from the dealers if it is split mate.
    "We are not some sort of dictatorship!"


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    Regular Member Big Knox's Avatar
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    thanks will have a look

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    leaking header tank would also be my first look

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    Try checking at night by torch light. When the air's cooler any steam will be more obvious and show up in the torch light.

    ...and it'll give the neighbours something to talk about.

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    You used to get crystals forming at the site of the leak with the old blue coolant dont know about nowa days though.

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    Default

    Check exhaust as well, slight blow in HG could blow steam through.

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    Regular Member Big Knox's Avatar
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    don't see a crack on the reservoir.

    Interestingly the coolant level hasn't gone down while the car hasn't been driven. So it appears to happen when engine is running. I looked at water pump and can't see any signed that liquid has been near the outside of it.

    Any ideas? very frustrated.

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    I think the hose pictured below might be the cause of my coolant leak. however it doesn't seem to leak all the time. Is the cable beside it controlling a valve or is it a sensor?

    Second picture to make location clearer.

    Thanks.

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    Default Pressure tester.

    You can make your own pressure tester.

    You need a tyre valve and a coolant cap, drill hole in cap for stem of valve to fit through and fit valve.

    Pump to no more than 13 psi with foot pump and spot your leaks.

    It works ok some caps have a valve under the cap remove this the best you can as it's only for a testing purpose and to release air remove valve core.

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