Engine Cooling Symptom Diagnosis
Precautions: Precautions for Cooling System · General safety (00)
| Condition | Possible Cause | Action |
|---|---|---|
|
Engine overheats (Radiator fan operates)
|
Loose or broken water pump belt
|
Adjust or replace water pump belt.
|
|
Not enough coolant
|
Check coolant level and add if necessary.
|
|
|
Faulty thermostat
|
Replace thermostat assembly.
|
|
|
Faulty water pump
|
Replace water pump.
|
|
|
Dirty or bent radiator fins
|
Clean or repair.
|
|
|
Coolant leakage on cooling system
|
Check cooling system for leakage.
|
|
|
Clogged radiator
|
Replace radiator.
|
|
|
Faulty radiator cap
|
Check radiator cap.
|
|
|
Dragging brakes
|
Check brake.
|
|
|
Slipping clutch
|
Check clutch.
|
|
|
Poorly charged battery
|
Check battery.
|
|
|
Poor electricity generated by generator
|
Check generator.
|
|
|
Faulty ECT sensor
|
Check ECT sensor.
|
|
|
Faulty radiator cooling fan motor
|
Check radiator cooling fan motor.
|
|
|
Faulty ECM
|
Check ECM and its circuit.
|
|
|
Faulty radiator cooling fan relay
|
Check radiator cooling fan relay.
|
|
|
Faulty wiring or grounding
|
Repair wiring.
|
|
|
Too many optional electric devices
|
Remove electrical devices.
|
|
|
Engine overheats (Radiator fan does not operate)
|
Blown fuse
|
Check fuse.
|
|
Faulty radiator cooling fan relay
|
Check radiator cooling fan relay.
|
|
|
Faulty ECT sensor
|
Check ECT sensor.
|
|
|
Faulty radiator cooling fan motor
|
Check radiator cooling fan motor.
|
|
|
Faulty wiring or grounding
|
Repair wiring.
|
|
|
Faulty ECM
|
Check ECM and its circuit.
|