Your radiator likely has blocked passages, since coolant has never been changed.
2002 S4 Laser/Silver 6-speed
Cold, Premium, Bose, Changer
<Brian May guitar riff>..."I'm in love with my car, got a feel for my automobile"...I OWN an S4, I DROVE many a service loaner from Enterprise! $19k+ worth of warranty repairs. Tally ended on 8-23-05! She's now free of the man; DIY all the way! Now spending AoA retroactive cash back bonus for crappy dealer service! Thanks for the check, AoA!
Please help to fight window-licking!
(I hear they have a cure over on Audizine...)