Festiva L4-81 1.3L SOHC EFI (1989)
Radiator Cooling Fan Motor: Description and Operation
The cooling fan system consists of an electro-mechanical fan, a temperature switch and a temperature relay.
The temperature switch, located in the thermostat housing, senses engine coolant temperature; while the relay, located in the left front corner of the
engine compartment between the battery and headlamp, provides the ground path to complete the circuit.
When coolant temperature is below approximately 194°F, the temperature switch is closed, while the relay contacts are held open by the magnetism
produced in the relay coil. When temperature is above approximately 207°F, the temperature switch is opened, allowing the relay contacts to close,
thereby completing the ground circuit and activating the cooling fan.
Vehicles equipped with air conditioning have an added relay in the circuit, allowing the bypassing of the engine temperature portion of the circuit, and
enabling fan activation any time the air conditioning system is in use.
