Radiator Cooling Fans
The ECM controls radiator cooling fan(s) based on vehicle speed, engine coolant temp. and A/C switch position. The following tables list correct cooling fan operation based on certain conditions. See A/C SWITCH ON or A/C SWITCH OFF tables. If cooling fan does not operate as specified, see RADIATOR (COOLING) FAN CONTROL TEST .
A/C SWITCH ON
| Engine Coolant Temp. °F (°C) | Vehicle Speed MPH | Radiator Fan |
|---|---|---|
| Less Than 203 (95) | 50 Or More | Off |
| Less Than 203 (95) | 49 Or Less | On |
| 203 (95) Or More | All Speeds | On |
A/C SWITCH OFF
| Engine Coolant Temp. °F (°C) | Vehicle Speed MPH | Radiator Fan |
|---|---|---|
| Less Than 195 (90) | All Speeds | Off |
| 196-202 (91-94) | 12 Or More | Off |
| 196-202 (91-94) | 11 Or Less | On |
| 203-212 (95-100) | 50 Or More | Off |
| 203-212 (95-100) | 49 Or Less | On |
| Greater Than 212 (100) | All Speeds | On |