BMW i4 2023–2024 — technical service bulletin
Bulletin B640224 · NHTSA communication 10250367 · issued Feb 5, 2024
Technical service bulletin
communication type
Electrical System
component
2023–2024
model years
5
vehicle entries
Official summary
The coolant changeover valve may develop a coolant leak when the outside temperatures go below 19à  à °F (-7à  à °C). The vehicles operating systems would also need to be at that same low temperature (example: being parked outside, overnight in low temperatures).
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.