i have got a B7 S4 estate and noticed a wet patch on the drive. i looked and found there are 3 radiators on the car, 1 main 1 at the front and 2 smaller ones each side of it. i found the one on the passengers side is leaking and wondered if any one else has had this problem?. its a 2005 '05' and has done 23,000 miles so surely it shouldn't have failed yet should it?