BMW M3 1994–2005 — technical service bulletin
Bulletin SI-B11-07-09 · NHTSA communication 10030850 · issued Aug 1, 2009
Technical service bulletin
communication type
Engine and Engine Cooling
component
1994–2005
model years
12
vehicle entries
Official summary
Bmw: thermostat housing inspection. The retaining springs of the thermostat housing quick release couplings for the coolant hoses may not be locked correctly. This situation may result in a coolant leak. Models affected are m3 sedan (e90), coupe (92), and convertible (393). No model years listed. *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.