Does your Justy use the same 1.2 litre 3-cylinder as ours?
We had a similar problem and I never did solve it - even after replacing the head gasket. Our Justy had so many mechanical problems it is difficult to tell what was causing the chocolate-milkshake effect.
Could it be the seal on the water pump letting coolant into the sump? If this seal is leaking, you should notice a trickle of water from a drain hole underneath the water pump.
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