Symptom Troubleshooting Index
SYMPTOM TROUBLESHOOTING REFERENCE TABLE
| Symptom |
Diagnostic Procedure |
Also check for |
| Engine overheats |
- Check the coolant level (see COOLANT CHECK
).
- Check for engine coolant leaks (from gaskets, hoses, O-rings, etc.).
- Check for dirt, leaves, or insects on the radiator and A/C condenser.
- Check for deteriorated coolant.
- Check for a damaged or deformed fan shroud.
- Check the fan motors for proper direction for proper direction of operation (blowing air toward engine).
- Inspect the fan motors (see FAN MOTOR TEST
or fan relays (see POWER RELAY TEST
).
- Check the radiator cap (see RADIATOR CAP TEST
).
- Check the thermostat (see FAN MOTOR TEST
).
- Inspect the water pump (see WATER PUMP INSPECTION
).
- Check for plugged or deteriorated radiator hoses.
- Check for a plugged heater core or hoses.
- Check for a damaged cylinder head gasket.
|
Proper radiator and condenser fan control and operation. |
| The radiator fan does not run at high speed. |
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. |
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. |
See A/C CONDENSER FAN HIGH SPEED CIRCUIT TROUBLESHOOTING
. |
Cleanliness and tightness of all connectors |