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Home >> Subaru >> 1983 >> DL 4D Sedan >> Repair and Diagnosis >> Engine Performance >> System >> EGR Function Testing >> Component Testing >> THERMO Vacuum Valve
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THERMO Vacuum Valve

  1. Remove thermal vacuum valve from intake manifold. Connect hoses to 2 upper ports and cap lower port. Submerge valve in container of water.
    CAUTION: Do not allow water to enter valve.
  2. With water below 86°F (30°C), blow air through valve. If air does not pass freely, replace valve. Heat water above 104°F (40°C). Replace valve. if air passes through.
Fig 1: Exhaust Gas Recirculation System (2WD Federal Models.)
G43482