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1976-77 Models

  1. Remove thermo valve and allow it to cool to room temperature. Check valve by blowing into vacuum fittings. Valve is normal if EGR fitting allows air to pass freely and distributor fitting is blocked.
  2. Immerse thermo sensor in 140°F (60°C) water, for at least one minute. Valve is normal if no air flows through either fitting. Immerse thermo sensor in boiling water for at least one minute. Valve is normal if EGR fitting blocks air and distributor fitting allows air to flow freely.
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