Just thought I'd add that before we went to France this summer I had the A/C's refrigerant replaced. The cabin was taking 15-20 mins to cool. I'd noticed over the years, it had been taking longer and longer to cool, but once cool kept cool.
The level of refrigerant was just over half of what it should've been.
Now the A/C is noticeably colder, quicker to cool and quieter. I'm not certain, but I think the fan isn't having to spin as fast etc.
Did 2,200 miles over the last few weeks in France and so far haven't noticed the annoying whine.
This could be because I had the wife and kids with me tho', maybe their whines were louder!
I'll have a proper listen tomorrow.
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2010 A8 SE Executive 4.2 FSI D4
2007 Mini Cooper S R56
2008 D3, gone, but not forgotten after 9 years and 90k.
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