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Home >> Nissan-Datsun >> 1981 >> 310 Base >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Mixture Ratio Feedback System >> Testing >> System Check >> Coolant Temperature Switch
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Coolant Temperature Switch

  1. Drain engine coolant, disconnect wiring, and remove coolant temperature switch.
  2. Connect ohmmeter leads to switch and place end of switch in a pan of water. When water temperature is below 68°F (20°C), ohmmeter should show continuity. When water temperature is above 104°F (40°C), ohmmeter should not show continuity. If switch does not operate within specifications, replace.
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