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Home >> Isuzu >> 1990 >> Impulse Standard >> Repair and Diagnosis >> Engine Mechanical >> Engine Cooling Fan >> Component Testing >> Cooling Fan THERMOSWITCH
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Cooling Fan THERMOSWITCH

  1. To test cooling fan thermoswitch, remove the thermoswitch from lower left side of the radiator. Heat thermoswitch in water to approximately 180-190°F (82-88°C).
  2. Using ohmmeter, ensure continuity exists between thermoswitch terminals. Reduce water temperature to approximately 167-178°F (75-81°C). Continuity should not exist between thermoswitch terminals. Replace thermoswitch if it does not function as described.
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