Thanks. I've had a further look this afternoon and I don't think the fuse box I mentioned in the first post is the one I want either now. It turns out the diagram I was looking at was for LHD cars. On RHD cars, the position I thought it was in is actually a window regulator fuse.
These are the diagrams I've been looking at:
http://www.syntag.ru/other/vag/a8/a8...s_location.pdf
I searched this file for the word 'blower'. I can't see where else it would be located on my car.
Does anyone know of any other fuse diagrams for the D3 A8? I don't have the original handbook that came with the car. I think it's a 30A (possibly a "thermal fuse" rather than a standard one?) but I'm not sure where to look next!
Thanks