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Symptom Troubleshooting Index

FAN CONTROL SYSTEM TROUBLESHOOTING CHART

Symptom Diagnostic Procedure Also check for
Engine overheats
  1. Check the coolant level (see COOLANT CHECK ).
  2. Check for any engine coolant leakage (from gaskets, hoses, O-rings, etc.).
  3. Check for dirt, leaves, or insects on radiator and A/C condenser.
  4. Check for deteriorated coolant.
  5. Check for a damaged or deformed fan shroud.
  6. Check the fan motors for proper direction of operation (blowing air toward the engine).
  7. Inspect the fan motors (see FAN MOTOR TEST ) or fan relays (see POWER RELAY TEST ).
  8. Check the radiator cap (see RADIATOR CAP TEST ).
  9. Check the thermostat (see FAN MOTOR TEST ).
  10. Inspect the water pump (see WATER PUMP INSPECTION ).
  11. Check for plugged or deteriorated radiator hoses.
  12. Check for plugged heater core or hoses.
  13. Check for a damaged cylinder head gasket.
 Proper radiator and condenser fan control and operation
The radiator fan does not run at high speed Radiator fan high speed circuit troubleshooting (see RADIATOR FAN HIGH SPEED CIRCUIT TROUBLESHOOTING  ). Cleanliness and tightness of all connectors
Both the radiator fan and the A/C condenser fan do not run at low speed Radiator and A/C condenser fans low speed circuit troubleshooting (see RADIATOR AND A/C CONDENSER FAN LOW SPEED CIRCUIT TROUBLESHOOTING ). Cleanliness and tightness of all connectors
The A/C condenser fan does not run at high speed A/C condenser fan high speed circuit troubleshooting (see A/C CONDENSER FAN HIGH SPEED CIRCUIT TROUBLESHOOTING ). Cleanliness and tightness of all connectors
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