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Symptom Troubleshooting Index

SYMPTOM TROUBLESHOOTING CHART

Symptom Diagnostic Procedure Also check for
Engine overheats
  1. Check the coolant level.
  2. Check for any engine coolant leakage (from gaskets, hoses, O-rings, etc.).
  3. Check for dirt, leaves, or insects on the radiator and A/C condenser.
  4. Check for deteriorated coolant.
  5. Check for damaged or deformed fan shrouds.
  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 THERMOSTAT 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.
 Check the radiator and A/C condenser fan are operating properly
The radiator fan does not run at high speed Radiator fan high speed circuit troubleshooting (see RADIATOR FAN HIGH SPEED CIRCUIT TROUBLESHOOTING  ). Check the connectors are properly connected and the terminals are making good contact
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 ). Check the connectors are properly connected and the terminals are making good contact
The A/C condenser fan does not run at high speed A/C condenser fans high speed circuit troubleshooting (see A/C CONDENSER FAN HIGH SPEED CIRCUIT TROUBLESHOOTING ). Check the connectors are properly connected and the terminals are making good contact
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