A D2 HVAC Heating challenge

[Nognar]

I have put a huge amount of time into working out the HVAC system and going through it with VAGCOM.

It’s damn complex and frustrating but over the past four weekends I have got a better understanding of it now.

My S8 shows me the same readings across all the measuring blocks as the A8 and appears that it should be working.

Though my S8 also blows hot for no apparent reason out the right side vent which I control the temp by turning the vent open or closed!

That’s a task for another day