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Home >> Mercury >> 1977 >> Capri II Ghia, Automatic Trans >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Ported Vacuum Switches >> Testing >> Electric Ported Vacuum Switch
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Electric Ported Vacuum Switch

  1. The PVS section should be checked as a regular three port PVS. To check the electrical section, connect a self powered test light to switch. See Fig 1. On the normally closed switch with the coolant temperature cold the light should glow.
    Fig 1: Testing Electric PVS Valve
    G09313245Courtesy of FORD MOTOR CO.
  2. With coolant temperature hot (235°F), the light should not light. On the normally open switch with coolant temperature cold, the light should not light. With coolant temperature hot (235°F) the light should glow. If either section of the electric PVS fails to operate as described, replace switch.