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Radiator Cooling Fan Temperature Sensor / Switch > < Understanding Track Style Wiring Diagrams, Important Stuff !|Page 1736
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Coolant Temperature Sensor/Switch (For Computer): Testing and Inspection

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disconnect thermoswitch harness connector from thermoswitch and measure resistance between terminals of switch

Checking specification if switch temperature is:
below 20°C (68°F) = Zero ohms (continuity)
over 40°C (104°F) = Infinite ohms (open)

If an acceptable value is NOT obtained

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replace thermoswitch

If an acceptable value is obtained

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check for open circuit using wiring diagram

Radiator Cooling Fan Temperature Sensor / Switch > < Understanding Track Style Wiring Diagrams, Important Stuff !|Page 1736