Hi, Much appreciated if forum member can advise me if it's normal for power steering pump to make whining noise?

Seems worse in winter and better in summer, but always there. had pump replace (twice!) by Audi, and technician tells me that it "works within spec".

last time they replaced pas pump, noise was reduced, but still cleary there.

Is this an inherent problem or do I just have oversensitive hearing?

Thanks....