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EGR System: Testing: THERMOVALVE: Carbureted

  1. Disconnect White-striped vacuum hose from thermovalve. Connect vacuum pump to nipple "A". See Figure . With engine coolant temperature at 50°F (10°C) or less, vacuum should leak when applied. With engine coolant temperature at 77°F (25°C) or more, vacuum should hold.
  2. Disconnect all vacuum hoses from thermovalve. Connect vacuum pump to nipples "B", "C" and "D" one at a time. Plug nipples other than one being tested.
  3. With engine coolant temperature at 104°F (40°C) or less, vacuum should leak when applied. With engine coolant temperature at 176°F (80°C) or more, vacuum should hold.
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