I went through everything in the end.
Checked all the motors, flaps and electrics and all were good. Replaced the water pump and valves for new also with no success (The ones removed were good in the end).
I topped up the coolant and went through VAGCOM and reset everything then proceeded with going through all the basic settings test to check it all works which it did.
All still with no luck.
I came to the conclusion in the end that the Heater matrix (x2) were blocked and needed to be cleaned or flushed.
At that time I fell out of love with the car after pouring nearly £2000 into it over 6 months and sold it.
I went on to buy the current D2 S8.
The new owner got back to me and he said unfortunately the problem was the heater matrixes but they needed replacement not flushing.
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