A/C blows warm: cracked cooler pipe (HI) A (TSB 07-002/21)
Added · Updated
What causes "A/C blows warm: cracked cooler pipe (HI) A (TSB 07-002/21)" on the Mazda Miata ND (2016-present US model years), and how is it fixed?
Engine vibration cracks the high-pressure cooler pipe A, letting refrigerant out. Fix: Dealers replace the pipe and recharge on cars with VINs below ...418386.
Symptoms
The air conditioning stops blowing cold.
Cause
Engine vibration cracks the high-pressure cooler pipe A, letting refrigerant out. The revised pipe uses a different material and thickness, and a section went from 12 to 16 mm diameter.
Fix (summary)
Dealers replace the pipe and recharge on cars with VINs below ...418386.
Related build entries
Other ND problems
- Recall 19V-072: automatic may downshift unexpectedly (TCM software)
- Recall 19V-496: under-engine skid plate may detach (2016)
- Recall 21V-875: low-pressure fuel pump may fail and stall the engine
- Recall 24V-695: front airbags may deploy with too much force
- Recall 25V-336: TCS/DSC warning light may not come on
- Early ND manual: grinding into 2nd or 3rd, or gears lost (TSB 05-001/17)
More for this car
- All Mazda Miata ND (2016-present US model years) fitment answers · ND common problems
- Newsletter archive: past issues with every new and corrected entry
Sources
- Mazda TSB 07-002/21: 2016-2020 MX-5 A/C blows warm from a cracked cooler pipe (HI) A (02/01/2021) — Mazda North American Operations (service bulletin) (mfr spec; read 2026-10-26; full page read)
Summaries are in our own words. Not repair instructions; consult the factory service manual.
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