# Thermostat full-open lift — minimum (NB1)

Canonical URL: https://miatatorque.com/spec/thermostat-full-open-lift-nb1/

Applicability: NB 1999–2000 (BP-4W) — Other years inferred from 1999 factory evidence.

Confidence: fsm

8.5 mm {0.33 in} minimum at 100°C {212°F}

Always confirm against your factory manual. Match every restriction and follow all stages and procedure notes. Disputed claims must not be automatically resolved. The complete record below preserves every printed unit, source claim and procedure.

```json
{
  "id": "thermostat-full-open-lift-nb1",
  "name": "Thermostat full-open lift — minimum (NB1)",
  "aliases": [],
  "applies_to": [
    {
      "gen": "NB",
      "years": [
        1999,
        2000
      ],
      "engines": [
        "BP-4W"
      ],
      "note": "Other years inferred from 1999 factory evidence."
    }
  ],
  "kind": "non-torque",
  "value_text": "8.5 mm {0.33 in} minimum at 100°C {212°F}",
  "procedure": {
    "notes": "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). Minimum lift at specified full-open temperature."
  },
  "confidence": "fsm",
  "sources": [
    {
      "source": "fsm-1999",
      "page": "01–12–5 (PDF p. 224)",
      "as_printed": "Full-open lift\nmm {in}\n8.5 {0.33} min.",
      "verified_years": [
        1999,
        1999
      ],
      "document": {
        "id": "fsm-1999",
        "tier": 1,
        "title": "1999 Mazda MX-5 Miata Workshop Manual",
        "covers": [
          {
            "gen": "NB",
            "years": [
              1999,
              2000
            ],
            "engines": [
              "BP-4W"
            ]
          }
        ],
        "url": "https://www.mellens.net/mazda/Mazda-Miata-1999-2001.pdf"
      }
    }
  ],
  "jobs": [],
  "system": "cooling",
  "component": "inventory-pass-2026-10",
  "componentName": "Service measurements and fasteners",
  "sequence_diagrams": [],
  "url": "https://miatatorque.com/spec/thermostat-full-open-lift-nb1/"
}
```