Procedures

1. Check fuse and fusible link. If satisfactory, proceed to step 2. If not satisfactory, repair or replace as required.
2. Bring engine to operating temperature while operating A/C to determine when cooling fan does or does not operate. If cooling fan operates only during A/C operation, proceed to step 3. If cooling fan does not operate at any time, proceed to step 13. If cooling fan operates only during high engine temperature, proceed to step 6.
3. With A/C off and ignition on, disconnect coolant temperature switch connector. Connect a jumper wire from connector to ground. If fan motor operates, proceed to step 4. If fan motor does not operate, proceed to step 5.
4. Using a suitable ohmmeter, check temperature switch body to thermostat housing continuity. If continuity does not exist (poor ground), tighten switch until continuity exists, then recheck operation. If continuity does exist between switch and thermostat housing, replace temperature switch.
5. Disconnect cooling fan controller connector, then using a suitable ohmmeter, check continuity of 197 circuit from controller to temperature switch. If continuity exists, replace controller. If no continuity exists, service 197 circuit.
6. With engine running, engage A/C clutch. If clutch engages, proceed to step 7. If clutch does not engage, check fuse. If satisfactory, proceed to step 9.
7. Check wide open throttle switch to determine if switch is opened or closed. If switch is open, adjust or replace switch as necessary. If switch is closed, proceed to step 8.
8. Disconnect cooling fan controller connector, then check for voltage at 354 circuit. If no voltage exists, service circuit as necessary. If voltage exists, replace controller.
9. With cooling fan controller connector disconnected and A/C on, check for voltage at 198 circuit. If no voltage exists, proceed to step 10. If voltage exists, replace cooling fan controller.
10. Disconnect A/C clutch cycling pressure switch, then using a suitable jumper wire, jump across connector. Again check for voltage at 198 circuit. If voltage exists, proceed to step 11. If voltage does not exist, proceed to step 12.
11. Check A/C system for sufficient charge. If charge is insufficient, leak test, repair and recharge system. If charge is sufficient, replace clutch cycling pressure switch.
12. Disconnect A/C control connector. Using a jumper wire, connect 321 circuit to 296 circuit. Check for voltage at 198 circuit and 348 circuit at cooling fan controller connector. If voltage exists at both circuits, replace A/C function selector switch. If voltage exists at 198 circuit only, service 348 circuit.
13. Disconnect fan motor electrical connector, then connect a jumper wire from motor ground connection to a known good ground and a jumper wire from motor B+ connection to battery positive terminal. If fan motor runs, proceed to step 14. If fan motor does not run, replace motor.
14. Remove jumper wires, then reconnect fan motor electrical connector to fan motor. Disconnect cooling fan controller connector and turn ignition On. Check for voltage at 37 circuit and 354 circuit. If no voltage exists at one or both circuits, service circuit(s) as necessary. If voltage exists at both circuits, proceed to step 15.
15. Using a jumper wire connect circuit 37 to circuit 228 at cooling fan controller. If fan motor runs, replace cooling fan controller. If fan motor does not run, service motor ground.