Engine Cooling Fan: Overview Lincoln Mark I

No High-Speed Fan Operation (2.2L With A/T)

1. Locate low-speed cooling fan relay No. 1 and high-speed cooling fan relay No. 2 (A/T), or cooling fan relay (M/T). Turn ignition on. Measure voltage on Black/Red wire at relay connector. If voltage is more than 10 volts, go to step 2). If voltage is less than 10 volts, repair Black/Red wire to relay.
2. Measure voltage on Black/White wire at relay connector. If voltage is more than 10 volts, go to step 3). If voltage is less than 10 volts, repair Black/White wire to relay.
3. Turn ignition on. Ground Black/Green wire terminal at cooling fan relay (M/T) or at low-speed cooling fan relay No. 1 connector (A/T). Measure voltage at Blue/Yellow wire at relay connector. If voltage is less than 1.5 volts with Black/Green terminal not grounded and more than 10 volts with Black/Green terminal grounded, go to step 4) for vehicles with A/T, or step 7) for vehicles with M/T. If voltage is not as specified, replace appropriate relay.
4. On vehicles with A/T, ground Blue/Red wire at relay terminal. Measure voltage (ignition on) of Blue/Black wire at cooling fan relay No. 2 (high-speed). If voltage is less than 1.5 volts with Blue/Red terminal not grounded and more than 10 volts with Blue/Red terminal grounded, go to step 5). If voltage is not as specified, replace cooling fan relay No. 2 (high-speed).
5. Turn ignition off. Measure resistance on Blue/Yellow wire between cooling fan relay (high-speed) and cooling fan resistor. If resistance is less than 5 ohms, go to step 6). If resistance is not less than 5 ohms, repair Blue/Yellow wire.
6. Measure resistance on Blue/Black wire between cooling fan resistor and cooling fan relay (high-speed). If resistance is less than 5 ohms, go to step 8). If resistance is not as specified, repair Blue/Black wire.
7. On vehicles with M/T, measure resistance (ignition off) of Blue/Yellow wire between cooling fan relay and cooling fan motor. If resistance is less than 5 ohms, go to step 8). If resistance is more than 5 ohms, repair Blue/Yellow wire.
8. On all vehicles, turn ignition off. Measure resistance of Black wire between cooling fan motor and ground. If resistance is less than 5 ohms, go to step 9). If resistance is more than 5 ohms, repair Black wire.
9. Using a fused jumper wire, apply battery voltage to Blue/Black wire terminal at cooling fan motor. If cooling fan motor does not run, replace defective cooling fan motor. If cooling fan motor runs, go to step 10) for vehicles equipped with A/T, or step 11) for vehicles equipped with M/T.
10. Apply battery voltage to Blue/Yellow terminal at fan motor resistor. If cooling fan motor runs, go to step 11). If cooling fan motor does not run, replace cooling fan motor resistor.
11. On all vehicles, turn ignition off. Measure resistance at Black/Green wire between ECU, test connector, radiator temperature switch, low-speed cooling fan relay (A/T), or condenser fan relay (M/T). If resistances are less than 5 ohms, go to step 12) for vehicles with A/T, or step 13) for vehicles with M/T. If resistances are more than 5 ohms, repair affected wire.
12. Measure resistance at Black/Red wire between cooling fan relay No. 2 (high-speed) and ECU, condenser fan relay, test connector and high-speed radiator temperature switch. If resistances are less than 5 ohms, go to step 14). If resistances are greater than 5 ohms, repair affected wire.
13. On vehicles with M/T, turn ignition on. Ground cooling fan motor test connector. Cooling fan motor should run. If cooling fan motor does not run, replace radiator temperature switch.
14. On vehicles with A/T, turn ignition on. Ground Black/Green terminal on cooling fan motor test connector. Cooling fan motor should run. If cooling fan motor does not run, replace low-speed radiator temperature switch. Ground Blue/Red terminal on test connector. Cooling fan motor should run. If cooling fan motor does not run, replace high-speed radiator temperature switch.