Audi A8 2003–2006 — technical service bulletin
Bulletin TSB-19-07-07 · NHTSA communication 10032810 · issued Dec 7, 2007
Technical service bulletin
communication type
Power Train
component
2003–2006
model years
4
vehicle entries
Official summary
Audi: poor or no heating in any or all heating zones. Ecm software updated with modified map controlled coolant thermostat specifications. The tcm software must also be updated to be compatible with the new ecm software level. Possible engine coolant scaling in hvac system. *pe
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.