Hi all, I have an issue with my a3 1.9tdi 2007, when the car is in idle for 30 seconds or more the revs increase to 1000 rpm and both engine fans kick in, this continues until the engine is switched off. This happens every time the car is switched on. This happened about a month ago so I researched it and I ended up replacing the battery because it was weak. No problems for around a month until now. Today I had the MAF out and cleaned it, refitted it and still no better!! It's so annoying when this happens as the cars noise increases so much......any ideas on what I should do next????