My 12 month old 1.8T 190 is losing about a pint of coolant a week and the warning flashes up about twice a month and needs a couple of pints refill each time. The dealer can find nothing wrong and it is booked in again next week. Anyone else had this fault and any ideas where to look? Also the climate would only throw cold air out one morning this week but it has gone back to normal now. Could this be connected?