Radiator Cooling Fans
The ECM controls radiator cooling fan(s) based on vehicle speed, engine coolant temperature 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 table. 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 201 (94) | 68 Or Less | Low |
| Less Than 201 (94) | 68 Or More | Off |
| 203-219 (95-104) | 11 Or Less | Low |
| " | 12 Or More | High |
| Greater Than 221 (105) | All Speeds | High |
A/C SWITCH OFF
| Engine Coolant Temp. °F (°C) | Vehicle Speed MPH | Radiator Fan |
|---|---|---|
| Less Than 201 (94) | All Speeds | Off |
| 203-210 (95-99) | All Speeds | Low |
| 212-219 (100-104) | 11 Or Less | Low |
| " | 12 Or More | High |
| Greater Than 221 (105) | All Speeds | High |