3-8 TROUBLESHOOTING
RADIATOR (COOLING SYSTEM)
Complaint
Symptom and possible causes
Remedy
Engine overheats
• Not enough engine coolant
• Radiator core clogged with dirt or scale
• Clogged water passage
• Air trapped in the cooling circuit
• Defective water pump
• Use incorrect coolant
• Defective ECM
• Defective ECT sensor
Add coolant
Clean
Clean
Bleed air
Replace
Replace
Replace
Replace
Engine overcools
• Extremely cold weather
Put on the radiator cover