Audi A4 2002–2005 — technical service bulletin
Bulletin 0503 · NHTSA communication 10015099 · issued Apr 8, 2005
Technical service bulletin
communication type
Engine and Engine Cooling
component
2002–2005
model years
4
vehicle entries
Official summary
Coolant leak or on heat in passenger compartment. *eh
Vehicles covered
What a TSB means. Technical service bulletins are repair guidance manufacturers send to dealers — they are not recalls, and repairs are not automatically free (warranty extensions are an exception worth checking). The full document is available via NHTSA’s vehicle lookup.