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Coolant Temperature Switch Test

  1. Remove switch from radiator or engine block. Place switch in container of coolant with thermometer. Connect ohmmeter to switch terminals. Slowly heat coolant.
  2. Note temperature at which continuity exists between switch terminals. Continuity should be present with coolant temperature greater than 207°F (97°C) and continuity should not be present with temperature less than 194°F (90°C). Replace switch if not operating as described.
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