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-circuited | Repair or replace. | |
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-circuited | Repair or replace. | |
5. Defective ECM | Replace. |