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Thread: water in header tank bubbling....why ?

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    Regular Member manimal's Avatar
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    Default water in header tank bubbling....why ?

    Hi
    I have a Vectra C 2002(52) 1800 petrol
    For a long time now i have had a problem with the water in the header tank.
    When i turn the engine off, the water starts bubbling rapidly like a cauldron.
    The temperature gauge reads correctly,no signs of overheating.
    Last week i had to replace the head due to a snapped cam belt.At the same time i had a water pump fitted & a crank sensor, but still the water is doing the same.I am puzzled as to why this is happening.
    Anyone shed some light on this please ?

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    Regular Member lanky659's Avatar
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    it could be the cap on the header tank that is causing this if you losing no water.

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    Regular Member manimal's Avatar
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    Thanks for the reply but i've already changed the cap

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    May be in idea to have a sniff test done in the header tank just in case the heads not bee torqued down correctly and youve got a leak.

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    Regular Member manimal's Avatar
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    I'll do that,but it had this problem before i had another head put on :-(

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    Coolant in a sealed system cannot boil. If yours is boiling you definitely have a leak somewhere in the system!

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    Regular Member the-wizard's Avatar
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    As above!,& this sounds like head gasket!, or a cracked head!!.

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    Regular Member manimal's Avatar
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    i've just had a look & i think my epansion bottle has a small leak.Would this cause it ?

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    Hello it's gases from the engine between the head gasket going back to the header tank it also could do damage to the rad so if I was you I would get the head gasket done plus check the head as well

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    Quote Originally Posted by manimal View Post
    i've just had a look & i think my epansion bottle has a small leak.Would this cause it ?
    Rather than guessing, why not just get the system pressure tested?

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