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Home >> Mercury >> 1976 >> Capri II Base, 2.3L Eng, Automatic Trans >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Cold Temp. Activated Vacuum System >> Testing >> Electrical Test
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Electrical Test

  1. Attach a grounded test light at point "B". Disconnect connector at point "D" and turn ignition on. See Fig 2. There should be no light, if there is a light, replace latching relay.
  2. Reconnect connector at point "D". There should be a light. If there is no light, check temperature switch and wiring back to ignition switch.
  3. Disconnect connector at point "D". There should be a light. If there is no light, replace latching relay.
  4. Connect test light to temperature switch terminal at point "D". Cool switch below 49°F (9°C), light goes out when cooled. If light stays on, replace temperature switch.
    Fig 1: Cold Temperature Activated Vacuum System Operation (Below 49°F)
    G09313219Courtesy of FORD MOTOR CO.
Fig 2: Testing Cold Temperature Activated Vacuum System
G09313220Courtesy of FORD MOTOR CO.
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