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Symptom Troubleshooting Index

TROUBLESHOOTING CHART

Symptom Diagnostic Procedure Also check for
Engine overheats
  1. Check the coolant level (see COOLANT CHECK ).
  2. Check for any engine coolant leaks (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 damaged or deformed fan shroud.
  6. Check that the fan motors are operating properly (air should be blowing 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 a 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 runs at low speed, but it 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 with the A/C on Radiator and A/C condenser fans 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 all. The radiator fan does not run at low speed, but runs at high speed A/C condenser fans high speed circuit troubleshooting.
 Check the connectors are properly connected and the terminals are making good contact
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