COOLING FAN SYSTEM PROBLEM SYMPTOMS TABLE

Tech Tips

Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes of the symptoms are listed in order of probability in the "Suspected Area" column of the table. Check each symptom by checking the suspected areas in the order they are listed. Replace parts as necessary.

Cooling Fan System
Symptom Suspected Area See page
Cooling fans do not operate Engine coolant temperature sensor

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Cooling fan motor

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No. 2 cooling fan motor

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Cooling fan circuit

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FAN relay

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Air conditioning system

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Engine room junction block assembly

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ECM

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Cooling fans do not stop Engine coolant temperature sensor

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Cooling fan circuit

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Air conditioning system

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Engine room junction block assembly

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ECM

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Cooling fan speed does not change Cooling fan circuit

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FAN relay

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Engine room junction block assembly

Click here

ECM

Click here