Freightliner Cascadia 2020–2025 — technical service bulletin
Bulletin FleetCom_Low Coolant · NHTSA communication 11026421 · issued Nov 19, 2025
Technical service bulletin
communication type
Engine
component
2020–2025
model years
17
vehicle entries
Official summary
Fleet Communications for Low Coolant Sensor
Vehicles covered
- 2020 Freightliner Cascadia
- 2021 Freightliner Cascadia
- 2022 Freightliner Cascadia
- 2023 Freightliner Cascadia
- 2024 Freightliner Cascadia
- 2025 Freightliner Cascadia
- 2022 Western Star 47X
- 2023 Western Star 47X
- 2024 Western Star 47X
- 2025 Western Star 47X
- 2021 Western Star 49X
- 2022 Western Star 49X
- 2023 Western Star 49X
- 2024 Western Star 49X
- 2025 Western Star 49X
- 2024 Western Star 57X
- 2025 Western Star 57X
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.