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Home >> Mazda >> 1984 >> B2200 >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Spark Control System >> Component Testing >> Water THERMO Valve >> California Models
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California Models

  1. Remove thermo valve from intake manifold and attach short lengths of vacuum hose to ports. Immerse base of valve in a container of water, ensuring vacuum ports are not submersed in water.
  2. Gradually heat water while observing water temperature. When water temperature reaches 122°F (50°C) or above, blow air into lower port, air should flow out upper port.