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