SERVICING INFORMATION 10-13 RADIATOR (COOLING SYSTEM) Complaint Symptom and possible causes Remedy Engine overheats 1. Not enough engine coolant Add coolant. 2. Radiator core clogged with dirt or scale Clean. 3. Faulty cooling fan Repair or replace. 4. Defective cooling fan relay, or open- or short- Repair or replace. circuited 5. Defective ECM Replace. 6. Defective ECT sensor Replace. 7. Clogged water passage Clean. 8. Air trapped in the cooling circuit Bleed air. 9. Defective water pump Replace. 10. Use incorrect coolant Replace. 11. Defective thermostat Replace. Engine overcools 1. Defective ECT sensor Replace. 2. Extremely cold weather Put on the radiator cover. 3. Defective thermostat Replace. 4. Defective cooling fan relay, or open- or short- Repair or replace. circuited 5. Defective ECM Replace. E L P M A S