Mine had a leak like that for a couple of years at one time. It would seemingly lose coolant randomly, or whenever I wasn't watching it. When I remembered to check it, it never seemed to go down. Then I'd forget to check it for a week or two, only to find that expansion tank was down below minimum again. I drove it for thousands of miles like that, with a small (concentrated) bottle of coolant inside the spare wheel for emergency top-ups.
In my case it turned out to be the radiator. When it went in for a major service the garage spotted a small hole in it that was slowly weeping coolant. They fitted a new radiator and I've had no loss of coolant since.
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Mark
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2002 FE S8 Ebony Black Pearl
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Cars Owned:
The Tesla Era: 2020 Model S Performance Ludicrous+ (present)
(Black, with all black premium interior and carbon fibre décor, 21" sonic carbon twin turbine wheels and FSD capability)
The Audi Era: '97 A8 4.2 (Ming Blue) --> '96 A8 4.2 QS (Dark Green) --> '02 FE S8 (present)
The Citroen Era: '84 BX 1.6 RS --> '89 BX 1.9 DTR Turbo --> '94 XM 2.0L Turbo --> '96 XM 2.0L Turbo Exclusive --> '00 Xantia Activa 2.0L Turbo
The Banger Era: '76 1.2L Lada VAZ-2101 (Ruski Fiat 124) --> '80 1.7L Morris Ital HL, finished in Ermine White and Rust
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