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Thread: Excessive pressure in coolant bottle

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  1. Excessive pressure in coolant bottle 
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    EddieLow23
    EddieLow23 is offline Engine idling
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    Default Excessive pressure in coolant bottle – 07-05-2019,09:30 PM
    Good day all

    A question I've been wanting to ask for quite awhile. Everytime I open the coolant cap cold, there will be a hiss/pressure release from the bottle (coolant level will rise by around 2cm). Checked the mrs' A3 (same car same engine), open the cap cold, no pressure. Checked my mates skoda fabia (which uses the same bottle), no hiss as well. Car drives fine, no burning coolant smell, no milkshake oil, no compression loss. However it does leak in random places time to time (due to old hoses or excessive pressure? I dunno). Now should I condemn the head gasket? Haven't done any combustion or compression test. Done a bit of reading and it seems a small head gasket leak would not show up in tests, and does give symptoms like mine.

    Thoughts?
     
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  2. Re: Excessive pressure in coolant bottle 
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    jonathanfenton
    jonathanfenton is offline A3 2.0 Sportback140 Sport
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    Default Re: Excessive pressure in coolant bottle – 07-05-2019,09:43 PM
    Mine does the same. BKD engine 206k on clock. Done it for last 100k. Never fathomed why.
     
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  3. Re: Excessive pressure in coolant bottle 
    #3
    EddieLow23
    EddieLow23 is offline Engine idling
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    Default Re: Excessive pressure in coolant bottle – 08-05-2019,04:28 PM
    Does yours have any coolant leak mate?
     
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  4. Re: Excessive pressure in coolant bottle 
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    jonathanfenton
    jonathanfenton is offline A3 2.0 Sportback140 Sport
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    Default Re: Excessive pressure in coolant bottle – 08-05-2019,04:29 PM
    Top it up a smidge probably every 6 months
     
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