High Speed Cooling Fans

The High 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 enable both fans on high speed when any of the following conditions exist:
- Certain PCM Diagnostic Trouble Codes (DTCs) set.
- The ECT above 112°C (234°F).
- The A/C high side pressure above 248 psi.

Once the high speed cooling fans are turned ON by the Engine coolant temperature, the PCM will turn the fans OFF when that temperature has dropped about 4°C (70°F). If the high 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 208 psi. The minimum ON time for the high speed cooling fans is 30 seconds.