Problem with mini engine please help

Discussion in 'Motoring' started by Jasonbbo, Aug 26, 2018.

  1. Jasonbbo

    Jasonbbo
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    hi all , iv a problem with a mini which I can’t seem to figure out I’ll give some details of the car
    Mini one
    2011
    1.6

    Ok there’s pressure building in the coolant system and bubbling so my first guess was the head gasket so tested for exhaust gas to my surprise there was none picked up (using that color changing liquid) so my next guess was the thermostat stuck closed and overheating making the coolant bubble, so changed that didn’t fix it so this is were it gets tricky only happens when engine is revs on Tick over its fine , now If you rev the engine and watch the coolant rise in the expansion as soon as you put the fan on hot or cold the coolant will return the original level and no more gas bubbles or pressure so can’t figure out what the fan has to do with pressure in the system please help
     
  2. k17chy

    k17chy
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    Could be the water pump.
     
  3. un1eash

    un1eash
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    I'd try a new expansion cap. Sounds similar to what happened to my Lotus. Water at pressure has a higher boiling point, if the cap seal has failed the system boils over.
    S2 111S Expansion Tank
     
    Last edited: Aug 27, 2018
  4. VFR

    VFR
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    Yes agreed fit a new cap first before you go any further.
     

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