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Symptom Troubleshooting Index

TROUBLESHOOTING TABLE

Symptom Diagnostic Procedure Also check for
Engine overheats
  1. Check the coolant level.
  2. Check for the coolant leakage (from gaskets, hoses, O-rings, etc.).
  3. Check for dirt, leaves, or insects on radiator and condenser.
  4. Check for a broken drive belt (see DRIVE BELT INSPECTION ).
  5. Check the drive belt auto-tensioner (see DRIVE BELT AUTO-TENSIONER INSPECTION ).
  6. Check for deteriorated coolant.
  7. Check for damaged or deformed fan shroud.
  8. Inspect the fan motors (see FAN MOTOR TEST ) or fan relays (see POWER RELAY TEST ).
  9. Check the radiator cap (see RADIATOR CAP TEST ).
  10. Check the thermostat (see FAN MOTOR TEST ).
  11. Inspect the water pump (see WATER PUMP INSPECTION ).
  12. Check for plugged or deteriorated radiator hoses.
  13. Check for plugged heater core of hoses.
  14. Check for a damaged cylinder head gasket.
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The radiator fan does not run at all (with A/C) RADIATOR FAN CIRCUIT TROUBLESHOOTING  Cleanliness and tightness of all connectors
The radiator fan does not run when the engine coolant temperature is above 199°F (93°C) (without A/C) RADIATOR FAN CIRCUIT TROUBLESHOOTING  Cleanliness and tightness of all connectors
The A/C condenser fan does not run at all (with A/C) A/C CONDENSER FAN CIRCUIT TROUBLESHOOTING Cleanliness and tightness of all connectors
Both the radiator fan and the A/C condenser fan do not run when the engine coolant temperature is above 199°F (93°C) (with A/C) RADIATOR FAN AND A/C CONDENSER FAN CIRCUIT TROUBLESHOOTING  Cleanliness and tightness of all connectors
The radiator fan runs with the ignition switch in ON (II) and the engine coolant temperature below 194°F (90°C) Remove the radiator fan relay. Cleanliness and tightness of all connectors
The A/C condenser fan runs with the ignition switch in ON (II) and the engine coolant temperature below 194°F (90°C) (with A/C) Remove the condenser fan relay. Cleanliness and tightness of all connectors
Both the radiator fan and the A/C condenser fan run with the ignition switch in ON (II) and the engine coolant temperature below 194°F (90°C) (with A/C) Check for a short in the wire between the radiator fan 4P socket terminal No. 3 and ECM/PCM connector terminal A6. Cleanliness and tightness of all connectors
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