Condenser Fan: Description and Operation
CIRCUIT DESCRIPTIONThe ECM (Engine Control Module) or PCM (Powertrain control module) controls the operation of the radiator fan motor and the condenser tan motor. The control module monitors coolant temperature through the engine coolant temperature sensor.
The module also monitors A/C operation through the A/C switch ON input and A/C pressure switch input. Using these input signals, the module controls the coil of the appropriate relays (condenser fan relays and radiator tan relay) to provide optimal cooling fan operation.