COOLING FAN SYSTEM PROBLEM SYMPTOMS TABLE
Tech Tips
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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.
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Inspect the fuses related to this system before inspecting the suspected areas below.
| Symptom | Suspected Area | See page |
|---|---|---|
| Cooling fans do not operate (main and sub fans) | Cooling fan circuit | |
| FAN No. 3 relay | ||
| Cooling fan motor | ||
| No. 2 cooling fan motor | ||
| Air conditioning system | ||
| ECM | ||
| Cooling fan does not operate (main fan) | Engine coolant temperature sensor | |
| Cooling fan circuit | ||
| FAN No. 1 relay | ||
| FAN No. 2 relay | ||
| Cooling fan motor | ||
| ECM | ||
| Cooling fan does not operate (sub fan) | Cooling fan circuit | |
| No. 2 cooling fan motor | ||
| Air conditioning system | ||
| ECM | ||
| Cooling fans do not stop (main and sub fans) | Cooling fan circuit | |
| Air conditioning system | ||
| FAN No. 3 relay | ||
| ECM | ||
| Cooling fan does not stop (main fan) | Engine coolant temperature sensor | |
| Cooling fan circuit | ||
| FAN No. 1 relay | ||
| ECM | ||
| Cooling fan speed does not change (main and sub | Engine coolant temperature sensor | |
| Cooling fan circuit | ||
| FAN No. 2 relay | ||
| ECM |