Update...
I have taken it to the aircon specialists that replaced the compressor (second hand) and confirmed the replacement compressor also definitely has a whine. They added the maximum amount of oil possible, which has quietened it a bit for now but it's unlikely to stay that way.
Genuine...
Yeah, only with AC on. Its not loud, just annoying - especially at low speeds. At higher speeds/rpm its not as noticeable. Its around 1500rpm, which under 50kph it likes to stay around. The high pressure hose and compressor have been replaced.
I have a ZB Calais V, recently purchased though a car yard. An issue that never presented itself at the time of purchase as it was cold, was the air conditioning performance and a whine around 1500rpm that only happens with the AC turned on.
Questions to anyone that has one of these:
Is an...