Mazda CX-30 2019–2020 — technical service bulletin
Bulletin 07-001-26 · NHTSA communication 11028094 · issued Jan 16, 2026
Technical service bulletin
communication type
Unknown OR Other
component
2019–2020
model years
3
vehicle entries
Official summary
Some customers may hear a repeating click sound when using the HVAC system (Auto A/C equipped vehicles only). The click sound may be caused by the air mix doors moving back and forth. This concern has been eliminated by a dash-electrical supply unit control software modification.
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.