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.
| Symptom | Suspected Area | See page |
|---|---|---|
| Cooling fans do not operate (No. 1 and No. 2 fans) | Cooling fan circuit | |
| Engine coolant temperature sensor | ||
| No. 3 cooling fan relay (FAN NO. 3) | ||
| ECM | ||
| Cooling fan does not operate (No. 1 fan) | Cooling fan circuit | |
| No. 1 cooling fan motor | ||
| No. 1 cooling fan relay (FAN NO. 1) | ||
| ECM | ||
| Cooling fan does not operate (No. 2 fan) | Cooling fan circuit | |
| No. 2 cooling fan motor | ||
| No. 2 cooling fan relay (FAN NO. 2) | ||
| No. 3 cooling fan relay (FAN NO. 3) | ||
| ECM | ||
| Cooling fans do not stop (continue to operate) (No. 1 and No. 2 fans) | Cooling fan circuit | |
| Engine coolant temperature sensor | ||
| No. 3 cooling fan relay (FAN NO. 3) | ||
| ECM | ||
| Cooling fan does not stop (continues to operate) (No. 1 fan) | Cooling fan circuit | |
| No. 1 cooling fan relay (FAN NO. 1) | ||
| ECM | ||
| Cooling fan does not stop (continues to operate) (No. 2 fan) | Cooling fan circuit | |
| ECM | ||
| Cooling fan speed does not change | Cooling fan circuit | |
| No. 2 cooling fan relay (FAN NO. 2) | ||
| ECM |