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 (1)
| Engine Coolant Temp. °F (°C) | Cooling Fan Speed | Relay No. (Off Or On) | ||
|---|---|---|---|---|
| Less Than 212 (100) | All Speeds | Low | ||
| Greater Than 212 (100) | All Speeds | High | ||
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A/C SWITCH OFF
| Engine Coolant Temp. °F (°C) | Vehicle Speed MPH | Radiator Fan |
|---|---|---|
| Less Than 203 (95) | All Speeds | Off |
| 203-212 (95-100) | All Speeds | Low |
| Greater Than 212 (100) | All Speeds | High |