DESCRIPTION
Power for cooling fan is provided by the 20-amp COOLING fuse (Capri) or C-FAN fuse (Festiva). Cooling fan is activated when ground is supplied for fan motor. On Festiva, ground can be supplied by fuel system ECA (located under the left side of dash), A/C cooling fan relay (if equipped) or cooling fan relay. (Scheme 1) On all models, when cooling fan is energized, relay contacts are open; when cooling fan is NOT energized, relay contacts are closed, providing ground through closed contacts to activate cooling fan. (Scheme 2)
Cooling fan relay is energized when coolant temperature switch is closed. This occurs when coolant temperature is less than 212°F (100°C) for Capri or 207°F (97°C) for Festiva. At temperatures greater than 212°F (100°C) for Capri or 207°F (97°C) for Festiva, coolant temperature switch opens and cooling fan relay is de-energized, closing relay contacts and energizing cooling fan.
When ECA senses A/C request, it energizes A/C cooling fan relay by providing a ground for relay windings on ECA pin 1Q. Power for the A/C cooling fan relay is provided by the HEATER fuse. On Capri, when A/C cooling fan relay is energized, it opens the power circuit for the cooling fan relay. On Festiva, when A/C cooling fan relay is energized, it provides an alternate path to ground for cooling fan motor. ECA also provides an alternate path to ground (at ECA pin 1R) for cooling fan motor based on input from coolant temperature sensor to ECA pin 2Q.
Scheme 1
COOLING FAN DOES NOT OPERATE OR OPERATES ERRATICALLY
If cooling fan does not run at any time, or operates erratically, check the following items to help locate fault.
- Check power fuse.
- Check cooling fan relay.
- Check coolant temperature switch.
- Check cooling fan wiring harness.
- Check cooling fan motor.
- Check A/C cooling fan relay.
COOLING FAN RUNS CONTINUOUSLY
If cooling fan runs continuously, check the following items to help locate fault.
- Check cooling fan relay.
- Check coolant temperature switch.
- Check cooling fan wiring harness.
- Check cooling fan motor.
- Check A/C cooling fan relay.
COOLING FAN DOES NOT RUN WITH A/C ON
If cooling fan does not run with A/C on, check the following items to help isolate fault.
- Check A/C cooling fan relay.
- Check cooling fan wiring harness.
VOLTAGE SUPPLY TEST
Disconnect cooling fan motor connector. Turn ignition on. Check for voltage at Yellow wire terminal of connector. If voltage is NOT present, check for blown 20-amp COOLING fuse (Capri) or C-FAN fuse (Festiva) or open in Yellow wire between cooling fan and fuse.
Disconnect cooling fan relay connector. Cooling fan relay is located in the left front corner of engine compartment. Turn ignition on. Check for voltage at Yellow (Capri) or Black/Yellow (Festiva) wire terminal of connector. If voltage is NOT present, check for blown 30-amp HEATER fuse on Capri or 10-amp METER fuse on Festiva or open in Black/Yellow wire between cooling fan relay and fuse.
Disconnect A/C cooling fan relay connector. On Capri, A/C relay is located in the left rear corner of the engine compartment, on firewall. On Festiva, A/C relay is located in the left front corner of engine compartment, under a triple relay cover. Relay may be identified by wire colors to relay connector. (Scheme 2)and (Scheme 3). Turn ignition on. Check for voltage at Blue wire terminal of connector. If voltage is NOT present, check for blown 15-amp HEATER fuse or open in Blue wire between A/C cooling fan relay and fuse.
GROUND CIRCUIT TEST
Turn ignition off. Unplug connectors from cooling fan and A/C cooling fan relays. Check for continuity between ground and Black wire terminal of relay connectors. If continuity is NOT present, repair Black ground wire.
FAN MOTOR TEST
Disconnect fan motor wire connector. Apply ground and battery voltage to motor connector. Fan should run. If fan does not run, replace cooling fan motor.
COOLING FAN RELAY TEST
Unplug cooling fan relay connector. Apply battery voltage and ground to Yellow and Green/Red (Capri) or Black/Yellow and Green/Yellow (Festiva) wire terminals of relay. Check continuity of relay across Yellow/Green (Capri) or Yellow/Red and Black (Festiva) wire connector terminals. Ensure continuity is NOT present while relay is energized. When relay is de-energized, continuity should exist.
A/C COOLING FAN RELAY TEST
Unplug A/C relay connector. Apply battery voltage and ground to Blue and White (Capri) or Blue and Green (Festiva) wire terminals of relay. Check continuity of relay across Blue and Red (Capri) or Yellow/Red and Black (Festiva) wire connector terminals. On Capri, ensure continuity does NOT exist while relay is energized. On Festiva, ensure continuity exists while relay is energized. On Capri, when relay is de-energized continuity should exist. On Festiva, when relay is de-energized, continuity should NOT exist.
COOLANT TEMPERATURE SWITCH TEST
Disconnect connector from coolant temperature switch located in thermostat housing. With coolant temperature less than 200°F (93°C) for Capri or 194°F (90°C) for Festiva, check continuity between ground and coolant temperature switch. Ensure continuity exists. Start engine and allow coolant temperature to reach 200°F (93°C) for Capri or 207°F (97°C) for Festiva. Check continuity between ground and coolant temperature switch terminal. Continuity should NOT be present. If switch does not test as indicated, replace switch.
HARNESS & CIRCUIT CHECK TEST
Turn ignition off. Disconnect harness connectors of the following components: ECA, cooling fan motor, coolant temperature switch, cooling fan relay and A/C cooling fan relay. Using an ohmmeter, check for continuity on the related harness leads of each connector. (Scheme 2)and (Scheme 3).
WIRING DIAGRAMS
For further detail, see appropriate chassis wiring diagram in the WIRING DIAGRAMS article in the WIRING DIAGRAMS section.
