What is the possible problems if anti-freeze goes down but there isn't a leak in an A6 and estimates for repairing each.
What is your question?
My 'turn off your engine and check coolant' warning light keeps coming on just a few days after adding coolant. I read it can be leaks but I can't find any leaks.
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IF you are adding coolant , then quite possibly , despite the fact(?) that you don't see a leak , there is in fact a leak......or blown head gasket/cracked head/block.