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Temperature Gauge

Auto Systems and Repair

A temperature gauge is a device on the dashboard that displays the engine coolant or oil temperature. It can either be an analog gauge with a needle, a segmented display that moves between hot and cold, or a digital display of the actual numerical temperature.

Symptoms of Wear or Failure

  • The gauge may read erratically or stick in the full hot or full cold position
  • The back lighting may fail, making the gauge hard to read at night
  • One or more "bars" of a segmented display may not illuminate

Related Repair Advice

  • A temperature sensor or sending unit monitors the fluid temperature; its electrical resistance varies depending on the fluid temperature
  • A faulty sending unit or its related wiring can also cause erratic gauge operation
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