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Pull the cooling fan relay. Check for power on terminals 2 and 3 and ground on terminal 1 and on terminal 3 when the engine is hot. Terminals 1 and 3 are the output to the cooling fan and the switch ground. Terminals 2 and 4 are fused power. If you're missing any of these when the engine is hot work backwards from the relay. Inspect the wiring. Check ...


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Test the coolant temperature sensor. Most vehicles have 2 temperature coolant sensors, one for the instrument cluster and one for the ECU. A repair manual for your vehicle (Haynes or Chilton) will tell you where it is and how to test it.



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