Radiator Fan Control
Fan control is accomplished three ways. The fan runs when the air conditioning pressure reaches a set pressure, refer to OPERATION chart. In addition to this control, the fan is turned on by the temperature of the coolant which is sensed by the coolant temperature sensor which sends the message to the Powertrain Control Module (PCM). The PCM turns on the fan through a fan relay. On models equipped with automatic transmission, a transmission fluid thermistor may have some influences on fan operation. See appropriate Wiring Diagrams Manual for circuity and diagnostics provided.
The Powertrain Control Module (PCM) provides fan control for the following conditions:
- The fan will not run during cranking until the engine starts no matter what the coolant temperature is.
- Fan will run when the air conditioning clutch is engaged, and once set compressor head pressure is reached. See charts.
- Fan will run according to the following information charts.
2.4L
| COOLANT TEMPERATURE | A/C PRESSURE | TRANSAXLE OIL TEMPERATURE | ||||
|---|---|---|---|---|---|---|
| Fan Operation Speeds: | Initial | Max | Initial | Max | Initial | Max |
| Fan On: | 104°C (220°F) | 110°C (230°F) Fan Speed Duty-Cycles (Ramps-up) from 30% to 99% | 1, 724 Kpa (250 psi) | 2, 068 Kpa (300 psi) Fan Speed Duty-Cycles (Ramps-up) from 30% to 99% | 96°C (204°F) | 111°C (232°F) Fan Speed Duty Cycles (Ramps-up) from 30% to 99% |
| Fan Off: | 101°C (214°F) | Fan Speed Duty-Cycles (Ramps-down) from 99% to 30% | 1, 710 Kpa (248 psi) | Fan Speed Duty-Cycles (Ramps-down) from 99% to 30% | 89°C (192°F) | Fan Speed Duty Cycles (Ramps-down) from 99% to 30% |
3.6L
| COOLANT TEMPERATURE | A/C PRESSURE | TRANSAXLE OIL TEMPERATURE | ||||
|---|---|---|---|---|---|---|
| Fan Operation Speeds: | Initial | Max | Initial | Max | Initial | Max |
| Fan On: | 104°C (220°F) | 110°C (230°F) Fan Speed Duty-Cycles (Ramps-up) from 30% to 99% | 1, 724 Kpa (250 psi) | 2, 068 Kpa (300 psi) Fan Speed Duty-Cycles (Ramps-up) from 30% to 99% | 96°C (204°F) | 111°C (232°F) Fan Speed Duty Cycles (Ramps-up) from 30% to 99% |
| Fan Off: | 101°C (214°F) | Fan Speed Duty-Cycles (Ramps-down) from 99% to 30% | 1, 710 Kpa (248 psi) | Fan Speed Duty-Cycles (Ramps-down) from 99% to 30% | 89°C (192°F) | Fan Speed Duty Cycles (Ramps-down) from 99% to 30% |
2.0L DIESEL
| COOLANT TEMPERATURE | A/C PRESSURE | TRANSAXLE OIL TEMPERATURE | FUEL TEMPERATURE | ||||
|---|---|---|---|---|---|---|---|
| Fan Operation Speeds: | Initial | Max | Initial | Max | Initial | Max | N/A |
| Fan On: | 97°C (206°F) | 105°C (221°F) | N/A | 17.3 Bar (251 PSI) | 95°C (203°F) | 130°C (266°F) | 90°C (194°F) |