Audi A3 1.6 TDI Coolant loss

LiquidHawk

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Hello guys,

I've been having a problem with my A3. It's 2014 with a 1.6TDI engine. I've noticed coolant loss(about half an inch in the coolant reservoir) every 4-5 days. I took it to the Audi dealer and they can't find the problem.
First, they tested it for external leaks and couldn't find any. Then they checked the EGR cooler and no luck. Now they took of the engine head of and the head gasket and tested it, but the head is fine.
They saw residue of coolant in the engine oil.
What could be the source of the problem? Any help is appreciated.

Thank you.