Radiator Cooling Fan Motor: Description and Operation

Figure 8-Fan Module:

All models use electric motor driven fans. The fan modules include a motor support and shroud. The module is fastened to the radiator by screws with square nuts and retaining clips.

The dual fan module is a combination of 2 fans mounted in a one piece shroud which operate at two 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.

Attempts to reduce high temperature gauge reading by increasing engine speed, can increase high temperature.


FAN SHROUD

All vehicles have fan shrouds to improve fan air flow efficiency. The shroud supports the electric fan motor and fan.

Fan control is accomplished five ways. A pressure transducer on the air conditioning compressor discharge line sends a signal to the Powertrain Control Module (PCM) which will activate both fans if necessary. In addition to this control, the fan is turned on based on coolant temperature sensor output to the (PCM). The PCM switches the fans on through the fan relays.

Switching through the (PCM) provides film control for the following conditions.

- Regardless of coolant temperature the fan will not run during cranking until the engine starts.

- Fans will run in accordance with following operation charts.