Showing specs for all NA & NB Miatas

Thermostat initial opening temperature (NB1)

183–190 °F (83.5–88.0 °C)83.5–88.0°C {183–190°F}

Factory manualTaken from a Mazda factory workshop manual, with page citation.
Procedure

Factory single-valve thermostat specification; this source does not use the NA8 main/sub-valve values. Inspect for opening at room temperature and for opening temperature and lift; replace as necessary. Repeated in technical data 01–50–2 (PDF313).

Applies to
  • NB 1999–2000 (BP-4W) — Other years inferred from 1999 factory evidence.
  • Verified in: 1999 Mazda MX-5 Miata Workshop Manual