Radiator Fan: Operation

The cooling system fans will operate at 2 speeds and are simultaneously activated. The dual fan system improves engine cooling and air conditioning performance in hot weather and severe driving conditions, while reducing fan noise and power consumption. The cooling fans will operate based on inputs to the Powertrain Control Module (PCM). When fan operation is determined necessary, the PCM provides a ground to the fan relay control circuit. The inputs provided to the PCM that influence fan operation are:

• Coolant Temperature Sensor
• Intake Air Temperature Sensor
• Output Speed Sensor
• Transmission Oil Temperature Sensor
• A/C Pressure Transducer