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 (TURBO) , A/C SWITCH ON (NON-TURBO) or A/C SWITCH OFF (TURBO & NON-TURBO) tables. If cooling fan does not operate as specified, see RADIATOR (COOLING) FAN CONTROL TEST .
A/C SWITCH ON (TURBO)
| Engine Coolant Temp. °F (°C) | Vehicle Speed MPH | Radiator Fan |
|---|---|---|
| Less Than 192 (89) | 24 Or Less | Off |
| 194-210 (90-99) | 24 Or Less | Low |
| More Than 212 (100) | 24 Or Less | High |
| Less Than 219 (104) | 25 Or More | Off |
| More Than 221 (105) | 25 Or More | On |
A/C SWITCH ON (NON-TURBO)
| Engine Coolant Temp. °F (°C) | Vehicle Speed MPH | Radiator Fan |
|---|---|---|
| Less Than 201 (94) | 24 Or Less | Off |
| More Than 203 (95) | 24 Or Less | On |
| Less Than 219 (104) | 25 Or More | Off |
| More Than 221 (105) | 25 Or More | On |
A/C SWITCH OFF (TURBO & NON-TURBO)
| Engine Coolant Temp. °F (°C) | Radiator Fan |
|---|---|
| Less Than 219 (104) | Off |
| More Than 221 (105) | On |