Hi all, Just done a long drive in my 98 S4, from Lowestoft to Horsham (155 miles) - faultless. It was between -2 and 1 degree all the way, with snow and plenty of cold. My thermostat is (I am sure) dodgy as I rarely see it hit 90 and sometimes not move at all, but I keep an eye on it and the oil temp comes up to around 80 afaik. Anyway, turned off the car after a gentle last few miles and a minute or two to cool the oil in the turbos and the fans came on and ran for about 15-20 minutes...! (they have finally just gone off) I havent driven the car for long distances for a while (due to other Siena related issues) but I dont recall it doing this - is my coolant sensor on its way out or what else causes the fans to run when the engine off? I did restart it and the water was showing 70 and the oil no more than 70 - any ideas? ta!