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Coolant Temperature Switch

  1. Drain engine coolant, disconnect wiring, and remove coolant temperature switch. Connect ohmmeter leads to switch and place end of switch in a pan of water.
  2. When water temperature is below 59°F (15°C) on Sentra models or 63°F (17°C) on 210 and 310 models, ohmmeter should show continuity.
  3. When water temperature is above 104°F (40°C) on Sentra models or 95°F (35°C) on 210 and 310 models, ohmmeter should not show continuity. If switch does not operate within specifications, replace it.
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