Freightliner 108SD 2020–2026 — technical service bulletin
Bulletin FleetCom_Heater Core · NHTSA communication 11027493 · issued Dec 11, 2025
Technical service bulletin
communication type
Engine
component
2020–2026
model years
56
vehicle entries
Official summary
Fleet Communications for Heater Core Plugging
Vehicles covered
- 2020 Freightliner 108SD
- 2021 Freightliner 108SD
- 2022 Freightliner 108SD
- 2023 Freightliner 108SD
- 2024 Freightliner 108SD
- 2025 Freightliner 108SD
- 2026 Freightliner 108SD
- 2020 Freightliner 114SD
- 2021 Freightliner 114SD
- 2022 Freightliner 114SD
- 2023 Freightliner 114SD
- 2024 Freightliner 114SD
- 2025 Freightliner 114SD
- 2026 Freightliner 114SD
- 2020 Freightliner 122SD
- 2021 Freightliner 122SD
- 2022 Freightliner 122SD
- 2023 Freightliner 122SD
- 2024 Freightliner 122SD
- 2025 Freightliner 122SD
- 2026 Freightliner 122SD
- 2020 Freightliner Business Class M2
- 2021 Freightliner Business Class M2
- 2022 Freightliner Business Class M2
- 2023 Freightliner Business Class M2
- 2024 Freightliner Business Class M2
- 2025 Freightliner Business Class M2
- 2026 Freightliner Business Class M2
- 2020 Freightliner Cascadia
- 2021 Freightliner Cascadia
- 2022 Freightliner Cascadia
- 2023 Freightliner Cascadia
- 2024 Freightliner Cascadia
- 2025 Freightliner Cascadia
- 2026 Freightliner Cascadia
- 2020 Thomas Built Buses Saf-T-Liner C2
- 2021 Thomas Built Buses Saf-T-Liner C2
- 2022 Thomas Built Buses Saf-T-Liner C2
- 2023 Thomas Built Buses Saf-T-Liner C2
- 2024 Thomas Built Buses Saf-T-Liner C2
- 2025 Thomas Built Buses Saf-T-Liner C2
- 2026 Thomas Built Buses Saf-T-Liner C2
- 2020 Western Star 47X
- 2021 Western Star 47X
- 2022 Western Star 47X
- 2023 Western Star 47X
- 2024 Western Star 47X
- 2025 Western Star 47X
- 2026 Western Star 47X
- 2020 Western Star 49X
- 2021 Western Star 49X
- 2022 Western Star 49X
- 2023 Western Star 49X
- 2024 Western Star 49X
- 2025 Western Star 49X
- 2026 Western Star 49X
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.