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 221 (105) |
11 Or Less |
Low |
| Greater Than 221 (105) |
11 Or Less |
High |
| Any Temperature |
11 Or Less |
High |
| Less Than 212 (100) |
12-50 |
Low |
| Greater Than 212 (100) |
12-50 |
High |
| Less Than 203 (95) |
51 Or More |
Off |
| 203-212 (95-100) |
51 Or More |
Low |
| 212-221 (100-105) |
51 Or More |
High |
A/C SWITCH OFF
| Engine Coolant Temp. °F (°C) |
Vehicle Speed MPH |
Radiator Fan |
| Less Than 203 (95) |
11 Or Less |
Off |
| 203-221 (95-105) |
11 Or Less |
Low |
| Greater Than 221 (105) |
11 Or Less |
High |
| Less Than 203 (95) |
12 Or More |
Off |
| 203-212 (95-100) |
12 Or More |
Low |
| Greater Than 212 (100) |
12 Or More |
High |