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Symptom Troubleshooting Index

SYMPTOM TROUBLESHOOTING

Symptom Procedure Also check for
Engine overheats
  1. Inspect the water pump (see WATER PUMP INSPECTION ).
  2. Check for a broken water pump belt (see WATER PUMP-A/C COMPRESSOR BELT INSPECTION AND ).
  3. Check for loose water pump belt (see WATER PUMP-A/C COMPRESSOR BELT INSPECTION AND ).
  4. Check the thermostat (see THERMOSTAT TEST ).
  5. Check for the coolant leakage (from gaskets, hoses, O-rings, etc.).
  6. Check for dirt, leaves, or insects on the radiator and the A/C condenser.
  7. Check for damaged or deformed fan shroud.
  8. Check for plugged or deteriorated radiator hoses.
  9. Check the radiator cap (see RADIATOR CAP TEST ).
  10. Inspect the fan motors or fan relays.
  11. Check for a plugged heater core or hose(s).
  12. Check the coolant level.
  13. Check for deteriorated coolant.
  14. Check for a damaged cylinder head gasket.
  
The radiator fan does not run at all (without A/C) Radiator Fan Circuit Troubleshooting without A/C (see WITHOUT A/C  ) Cleanliness and tightness of all connectors
The radiator fan does not run at all (with A/C) Fan Motor Test (see THERMOSTAT TEST ). If the radiator fan motor is OK, check for a poor ground (G301). Cleanliness and tightness of all connectors
The radiator fan does not run for engine cooling, but it runs with the A/Con Radiator Fan Circuit Troubleshooting with A/C (see WITH A/C  ) Cleanliness and tightness of all connectors
Both the radiator fan and the A/C condenser fan do not run at all
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