Several times recently I have noticed that when I use the 3 buttons on the left side of the ventialtion controls panel to direct the flow of air (especially when it's really cold outside) that when I then press the "auto" button on the fan controller the noise of the air distribution sounds like all the vents have closed and the air is being forced through almost closed flaps. The air flow is also much less. Is my air blending/distribution system not working properly in auto or are they all like this? In Auto, after a while, the fan automatically reduces speed so that it is almost silent but the air flow is still feeble, but there is an airflow. 2020 Pangea Green 1st Edition D240 New Defender 110 is here and loving it
2018 Melting Silver Mini Countryman PHEV - soon to be replaced
2015MY Corris Grey SDv6 HSE Dynamic, the best car I have ever owned, totally reliable only a cou0le of rattles in 3 years, now no longer in my care
Also in my garage is a 1996 TDi300 Defender 90 County HT made into a fake CSW

Thats bad news Tim in your neck of the woods. I would think its time for full heat!
There is a proceedure on the dealer test equipment to try this out and activate all components
I would suggest a trip to the dealers
Also there is a reset proceedure (reset adaptions) on the machine that puts all blend/distribution system back in line. This might be all you need.
Good luck with it You don't stop playing because you get old, You get old because you stop playing.

07 TDV6 been and gone. 08 TDV6 been and gone. 08.5 TDV8 in evaluation mode and now gone. BMW 535D M sport Been and gone, Now time for RRS No4 - TDV6 HSE in Stornaway with Ebony - 09 Model 6 months old.
RS Cosworth 4x4 Stage 2 Mint for summer
Audi TT
Astra VXR for the daughter.

And was there not a software update last year some time that addressed some issues with the aircon? 

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