Mazda MX-5 2016–2020 — technical service bulletin
Bulletin 07-002-21-3774 · NHTSA communication 10188019 · issued Feb 1, 2021
Technical service bulletin
communication type
Engine and Engine Cooling
component
2016–2020
model years
5
vehicle entries
Official summary
Some vehicles may experience that the A/C does not blow cold air (blows warm air) due to a refrigerant leak. This is caused by a crack in the cooler pipe (HI) A (1) due to engine vibration. To correct this issue, the material and thickness of the cooler pipe (HI) A has been changed to increase durability (pipe diameter has been changed from 12mm to 16mm).
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.