Mazda Miata NC (2006-2015 US model years): Cooling mods
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What are the best cooling mods for the Mazda Miata NC (2006-2015 US model years)?
It depends on the car’s condition and how you use it. These are the 1 cooling build entry we have sourced for this car: Replace the NC plastic coolant expansion tank (Reported). Each lists caveats, related problems and sources so you can match it to your goal.
Replace the NC plastic coolant expansion tank Reported
Swap the pressurised plastic tank for a revised Mazda tank or a bolt-in aluminum one, and replace an aging plastic-tank radiator once its tanks discolour.
Caveats: Burp the cooling system after the job. A radiator with plastic tanks lasts roughly a decade.
Related issues: Plastic coolant expansion tank cracks and dumps coolant
Parts: Moroso aluminum coolant expansion tank (NC), Koyo-built stock replacement style radiator, plastic tanks (NC, MT and AT)
Sources (4)
- Moroso aluminum coolant expansion tank for NC — Flyin' Miata (parts vendor) (vendor article; read 2026-10-26; full page read)
- NC coolant tank replacement (Sept. 2020 tech article) — Midstate Miata Club (club tech article) (editorial; read 2026-10-26; full page read)
- NC tech note: coolant expansion tank failures and stuck thermostat — MX-5 Club of Victoria (club tech article) (editorial; read 2026-10-26; full page read)
- NC stock replacement style radiator — Flyin' Miata (parts vendor) (vendor article; read 2026-10-26; full page read)
More for this car
- All Mazda Miata NC (2006-2015 US model years) fitment answers · NC common problems
- Newsletter archive: past issues with every new and corrected entry
Report a correction — spotted an error or have a better source? Email hello@chassisdex.com.