SERVICING INFORMATION 10-9
RADIATOR (COOLING SYSTEM)
Complaint Symptom and possible causes Remedy
Engine overheats Defective engine internal parts
1. Heavy carbon deposit on piston crown
2. Not enough oil in the engine
3. Defective oil pump or clogged oil circuit
4. Sucking air from throttle body joint or intake pipe
5. Use incorrect engine oil
6. Defective cooling system
Lean fuel/air mixture
1. Short-circuited IAP sensor/lead wire
2. Sucking air from throttle body joint or intake pipe
3. Defective fuel injector
4. Defective ECT sensor
Other factors
1. Ignition timing is too advanced due to defective
timing advance system (ECT sensor, CKP sensor
and ECM).
Clean.
Add oil.
Replace or clean.
Retighten or replace.
Change.
See cooling section.
Repair or replace.
Retighten or replace.
Replace.
Replace.
Replace.
Dirty or heavy
exhaust smoke
1. Too much engine oil in the engine
2. Worn piston rings or cylinder
3. Worn valve guides
4. Scored or scuffed cylinder wall
5. Worn valve stems
6. Defective valve stem oil seals
7. Worn oil ring side rails
Drain out excess oil.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Slipping clutch 1. Worn or damaged clutch shoes
2. Weakened clutch shoe springs
3. Worn clutch housing
4. Worn or slipping drive belt
Replace.
Replace.
Replace.
Replace.
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 thermo-switch
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
Add coolant.
Clean.
Repair or replace.
Replace.
Replace.
Replace.
Clean.
Bleed air.
Replace.
Replace.
Replace.
Engine overcools 1. Defective ECT sensor
2. Extremely cold weather
3. Defective thermostat
4. Defective cooling fan thermo-switch
5. Defective ECM
Replace.
Put on the radiator cover.
Replace.
Replace.
Replace.
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