A/c System General Diagnostic Procedures: Other Eagle Summit I

Compressor Not Working

1. Compressor clutch circuit open.
2. Compressor clutch coil inoperative.
3. Poor clutch ground connection.
4. Fan belts loose.
5. Thermostatic switch inoperative.
6. Thermostatic switch not adjusted.
7. Ambient temperature switch open.
8. Superheat fuse blown.

Insufficient or No Cooling; Compressor Working

1. Expansion valve inoperative.
2. Heater control valve stuck open.
3. Low system pressure.
4. Blocked condenser fins.
5. Blocked evaporator fins.
6. Vacuum system leak.
7. Vacuum motors inoperative.
8. Control cables improperly adjusted.
9. Restricted air inlet.
10. Mode doors binding.
11. Blower motor inoperative.
12. Temperature above system capacity.

Insufficient, Erratic, or No Heat

1. Low coolant level.
2. Incorrect thermostat.
3. Restricted coolant flow through heater core.
4. Heater hoses plugged.
5. Misadjusted control cable.
6. Sticking heater control valve.
7. Vacuum hose leaking.
8. Vacuum hose blocked.
9. Vacuum motors inoperative.
10. Blocked air inlet.
11. Inoperative heater blower motor.
12. Oil residue on heater core fins.
13. Dirt on heater core fins.

Too Much Heat

1. Improperly adjusted cables.
2. Sticking heater control valve.
3. No vacuum to heater control valve.
4. Temperature door stuck open.

Airflow Changes During Acceleration

1. Vacuum system leak.
2. Bad check valve or reservoir.

Air From Defroster At All Times

1. Vacuum system leak.
2. Improperly adjusted control cables.
3. Inoperative vacuum motor.

Blower Does Not Operate Correctly

1. Blown fuse.
2. Blower motor windings open.
3. Resistors burned out.
4. Motor ground connection loose.
5. Wiring harness connections loose.
6. Blower motor switch inoperative.
7. Blower relay inoperative.
8. Fan binding or foreign object in housing.
9. Fan blades broken or bent.