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Home >> BMW >> 1976 >> 2002 Automatic Trans >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Vacuum Advance/Retard Systems >> Testing >> Coolant Temperature Switch >> 1975-76 530i & 3.0Si Models
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1975-76 530i & 3.0Si Models

  1. With coolant temperature below 113°F (45°C) and ignition on (engine off), unplug connector at vacuum solenoid valve. Probe connector terminal with test light. Test light should come on.
  2. Start and run engine until coolant temperature is over 113°F (45°F). Test light at vacuum solenoid valve connector should go out. If test light does not work as indicated, temperature switch relay is defective.
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