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Symptom Troubleshooting Index

TROUBLESHOOTING CHART

Symptom Diagnostic procedure Also check for
Engine overheats
  1. Inspect the water pump (see WATER PUMP INSPECTION ).
  2. Check for a broken drive belt (see DRIVE BELT REPLACEMENT ).
  3. Check the drive belt auto-tensioner (see DRIVE BELT AUTO-TENSIONER INSPECTION ).
  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 radiator and 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 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 Radiator fan circuit troubleshooting (see RADIATOR FAN CIRCUIT TROUBLESHOOTING  ). Cleanliness and tightness of all connectors
The radiator fan does not run for engine cooling, but it runs with the A/C on Radiator fan switch circuit troubleshooting (Open) (see RADIATOR FAN SWITCH CIRCUIT TROUBLESHOOTING (OPEN)  ). Cleanliness and tightness of all connectors
The radiator fan runs with the ignition switch ON (II), the A/C off, and the engine coolant temperature below 199°F (93°C) Radiator fan switch circuit troubleshooting (Short) (see RADIATOR FAN SWITCH CIRCUIT TROUBLESHOOTING (OPEN)  ). Cleanliness and tightness of all connectors
The A/C condenser fan does not run at all (but the radiator fan runs with the A/C on) A/C condenser fan circuit troubleshooting (see A/C CONDENSER FAN CIRCUIT TROUBLESHOOTING ).
Both the radiator fan and the A/C condenser fan do not run with the A/C on (but the A/C compressor runs with the A/C on) Radiator and A/C condenser fan common circuit troubleshooting (see RADIATOR AND A/C CONDENSER FAN COMMON CIRCUIT TROUBLESHOOTING ).
The A/C compressor clutch does not engage (but both the radiator fan and the A/C condenser fan run with the A/C on) A/C compressor circuit troubleshooting (see A/C COMPRESSOR CLUTCH CIRCUIT TROUBLESHOOTING ).
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