BMW X3 2018–2019 — technical service bulletin
Bulletin B640518 · NHTSA communication 10152673 · issued Nov 1, 2018
Technical service bulletin
communication type
Visibility
component
2018–2019
model years
2
vehicle entries
Official summary
EXCESS NOISE WHEN DEFROST BLOWER IS AT MAX. Loud, rushing, wind noise is heard from ventilation outlets when defroster blower is set at maximum speed. Software error in IHKA (Automatic Climate Control) module. Ventilation duct noise.
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.