I had coolant light come on 3 weeks ago, checked the tank and it was below MIN. Went to Audi and got some G12 plus, topped up with coolant and water to the max mark when everything was stone cold. 3 weeks later the coolant level again is below min. Shouldnt be losing that amount of coolant so soon so Im booked in with Macclesfield Audi this thursday and have a courtesy car reserved for me. My car still has another 10 months warrenty left. I thought this issue was mainly with 2004 A3's? Mines a 56 plate covered appx 32000 miles. Could be anything from leaky pipes to leaky rad to cracked cylinder head. As long as it gets fixed ok under warrenty I dont care. Will keep you updated.