Technical Coolant temp gauge fluctuating

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Technical Coolant temp gauge fluctuating

If you top up with water then you won't even see the leak (onto the hot oil filter next to the even hotter exhaust manifold). Anti-freeze paints it turquoise/pink.

Or blown head gasket into the combustion chamber (check for bubbles with the car running/get a CO2 testing kit/check the combustion chamber with an endoscope for ridiculous cleanliness)
 
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