2011 Octavia Mk2 Facelift VRS Petrol Hatchback 

I have noticed the A/C system has become quite noisy (when running obviously), mainly noticeable at low revs, like a whiney drone sound.

I have checked the accessory drive belt and it has good tension (not loose) and doesn't feel worn or perished as far as I can tell (40k miles on car)

The only other thing I can think of is the A/C compressor pump, bearings etc which will be expensive! 

A/C system works fine otherwise. AC was regassed & checked last summer recently so its not that.

Anyone had experience of this issue ?

many thanks in advance 

I also have this annoying whine/groan! But have not had a chance to pop it up to the garage for a looksy. Be interesting to see what this thread unearths.

Wow, I’m having this same issue too, initially thought it was a transmission noise until I switched the ac off today and the noise disappeared! Not had a chance to have a proper look at the car yet though.