← Mazda Miata NB (1999-2005 US model years) problems
Plastic radiator end tanks go brittle; airflow blockage
Reported · Severity: Medium · Years: 1999-2005
Symptoms
Coolant seepage at the radiator; overheating in hot climates.
Cause
R&T says the cooling system is relatively weak, original plastic end tanks can be brittle, and bulky grille accessories or driving lights can reduce airflow.
Fix (summary)
Budget for an all-aluminum radiator and keep the grille opening clear.
Related parts
Sources
- Everything You Need to Know Before Buying a Second-Gen Mazda Miata — Road & Track (Jun 2016) (editorial; read 2026-10-15; full page read)
Summaries are in our own words. Not repair instructions; consult the factory service manual.