BMW 228I 2014–2021 — technical service bulletin
Bulletin B640621 · NHTSA communication 10204657 · issued Sep 1, 2021
Technical service bulletin
communication type
Engine and Engine Cooling
component
2014–2021
model years
24
vehicle entries
Official summary
Different air temperatures are felt from left to right out of the front fresh air grilles (air vents).
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.