Thank you Gareth. I have spoken with Audi UK this morning and they have affectively said there is nothing that they can do. The report from the Audi dealership states that the issue (they now believe) is a “contaminated coolant container”.
As I pointed out to them it is not an area of the car that is ever been touched by anyone who operates outside of the Audi brand, it was actually touched in October 2020 by the Audi dealership in question, so if contamination is the issue, then the most likely contaminant would be that job. How else do you get a dirty coolant container unless there’s a fault? My biggest annoyance here is that they don’t even know that that is the issue, that is their theory currently, but they want me to pay £800 to test their hypothesis.
Audi UK are comfortable that I should be playing for what they call “additional exploratory work” even though the car is under warranty. My view is that the heating isn’t working and they need to do what is required to ascertain what the issue is (especially given their prior dealing with this particular part of the car). When they find the issue, if it’s covered under warranty they pay, if it isn’t then I pay. The fact nobody can tell me what the issue is, but only that they want me to pay £800 to find out, is incredibly frustrating.
Anyway, top and bottom of it from Audi UK is that they won’t help me and that they have told me to contact the motor ombudsman if I’m not happy. I’m considering taking the car to a trusted independent garage to investigate (remove the silica bag and check it). They will also likely charge significantly less for the required coolant flush. What are your thoughts?