Low Speed Cooling Fans

The low speed cooling fans are controlled by the PCM based on the following inputs:
- The A/C system.
- The Engine Coolant Temperature (ECT) sensor.
- The Vehicle Speed Sensor (VSS).

The PCM will turn the cooling fans on low speed when any of the following conditions exist at idle:
- Certain PCM Diagnostic Trouble Codes (DTCs) are set.
- The ECT above 108°C (226°F).
- The A/C high side pressure above 215 psi.

Once the low speed fans are turned ON by Engine Coolant Temperature, the PCM will turn the fans OFF when that temperature has dropped about 4°C (70°F). If the low speed cooling fans are turned ON by high A/C head pressure, the PCM will turn the fans OFF when the pressure has dropped to 190 psi. The minimum ON time for the low speed cooling fans is 50 seconds.

The cooling fans are turned OFF at certain vehicle speeds. Adequate airflow through the A/C condenser and radiator occurs with vehicle movement to properly cool the A/C refrigerant and engine coolant without the assistance of the cooling fans.