Fan Blade: Testing and Inspection

DIAGNOSIS AND TESTING - RADIATOR FAN CONTROL
Radiator fan control can be 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 fans are turned on based on coolant temperature sensor, intake air temperature sensor, output speed sensor, and transmission oil temperature sensor output to the PCM. The PCM switches the fans on through the fan relays.

The PCM provides fan control for the following conditions:
^ Regardless of coolant temperature the fan will not run during cranking until the engine starts.





Radiator Fan Operations - 2.7L Engine





Radiator Fan Operations - 3.5L Engine

^ Fans will run in accordance with the specifications listed in the following operation charts.