COOLING FAN SYSTEM PROBLEM SYMPTOMS TABLE
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.
| Symptom | Suspected Area | See page |
|---|---|---|
| Cooling fans do not operate | Engine coolant temperature sensor | |
| Cooling fan motor | ||
| NO. 2 cooling fan motor | ||
| FAN NO. 1 relay | ||
| FAN NO. 2 relay | ||
| FAN NO. 3 relay | ||
| Cooling fan circuit | ||
| ECM | ||
| Cooling fans do not stop | Engine coolant temperature sensor | |
| FAN NO. 1 relay | ||
| FAN NO. 3 relay | ||
| Cooling fan circuit (for short circuit) | ||
| ECM | ||
| Cooling fan speed does not change | FAN NO. 2 relay | |
| Cooling fan circuit | ||
| ECM |