# Radiator cap pressure test (NB1)

Canonical URL: https://miatatorque.com/spec/radiator-cap-test-pressure-nb1/

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

Confidence: fsm

94–122 kPa {0.95–1.25 kgf/cm², 13.5–17.7 psi}; hold 10 s

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": "radiator-cap-test-pressure-nb1",
  "name": "Radiator cap pressure test (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": "94–122 kPa {0.95–1.25 kgf/cm², 13.5–17.7 psi}; hold 10 s",
  "procedure": {
    "notes": "Attach removed cap to cap tester with proper adapter and gradually apply pressure. Pressure must stabilize in specification and hold 10 seconds. Cap test, separate from system leakage test on the same page. Repeated in technical data 01–50–2 (PDF313)."
  },
  "confidence": "fsm",
  "sources": [
    {
      "source": "fsm-1999",
      "page": "01–12–3 (PDF p. 222)",
      "as_printed": "Pressure\n94—122 kPa\n{0.95—1.25 kgf/cm², 13.5—17.7 psi}",
      "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/radiator-cap-test-pressure-nb1/"
}
```