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Engine Coolant Temperature Gauge Circuit Test

  1. Disconnect engine coolant temperature sender connector. Turn ignition on. Temperature gauge should indicate COOL. Turn ignition off. Connect a 12-volt, 3.4-watt test light between coolant temperature sender harness connector terminal and ground.
  2. Turn ignition on. Test light should be on and temperature gauge should slowly move toward HOT. If gauge functions as specified, replace sending unit. If gauge does not function as specified, perform ENGINE COOLANT TEMPERATURE GAUGE RESISTANCE  test.
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