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Thermal Vacuum Valve

  1. Drain engine coolant. Remove thermal vacuum valve from engine leaving hoses attached. Without letting water enter valve, submerge valve and thermometer in a container of water.
  2. Heat water and observe temperature. Apply vacuum to EGR port. Check that valve opens and closes according to specified value. If valve does not operate as specified, replace it.
    Fig 1: Datsun Thermal Vacuum Valve (TVV)
    G09315626Courtesy of NISSAN NORTH AMERICA, INC.
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