Cracked coolant expansion pipe where the small hose connects also leads to slow coolant loss and is a common problem, mine has been replaced twice and is cracked once again. Another thing could be valves sticking open in the expansion tank cap so water is slowly evaporating or can be pushed out if car gets too warm (also happened to mine, failed electric fan meant it was getting a bit warm and stuck valves in cap meant coolant was disappearing.)
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Currently 8less
2011 Q7 S Line 3.0TDI, 2016 Tesla Model S 90D
8 history:
2006 A8 Sport 4.2TDI quattro SOLD,
1997 S8, reached end of life with gearbox failure
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