New to forum, just bought an A3 2.0 TDi 54 plate.

Hi everyone out there. I've just bought an Audi 2.0 TDi, love it, goes like the clappers and I acheived 59+mpg from the first tank, which is amazing. The only thing I seem to have is a few electrical gremlins, of which a few I knew before I got it, but I haggled the price down significantly. The drivers window does not work, the aircon blows warm, the rheostat is intermittent and the Amber engine light comes on too...apart from that it's brill! Any ideas on these? I'm used to Japanese cars that are bland, but they don't ever seem to get these 'glitches'