Heating / air conditioning

Hello V8 fan community,
I am new to this forum and would like to say Moin for a short time and that your contributions have already helped me well.
For some time I have been visiting this page regularly because I had a problem with my heating; (it just didn't get warm), which after reading unspeakable many forum articles turned out to be a change motor error of the temperature control valve, in particular cold soldering points.

However, a second error was added when reading out my fault memory of the air conditioner. This is the error "Donors for coolant temperature has interruption"

Now to my questions:
My air conditioning system works perfectly, what does this giver have on it, what is it good for?
Was kann passieren, wenn er weiterhin defekt bleibt?
Can it cause consequential damage?

And then I would be grateful for a hint, someone can tell me if there is a repair instruction especially for the V8 e.g. "that's how I help myself"?
And so far, yes, can anyone give me the ISBN number of that? Or maybe even someone has a used one slumbering around in a corner and thus left?

First of all, thank you very much in advance.
Peter