Cooling Fan Controls Symptom Troubleshooting Index

Cooling Fan Controls Symptom Troubleshooting Index

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 the A/C condenser- 4- Check for deteriorated coolant- 5- Check for a damaged or deformed fan shrouds- 6- Check the fan motors are operating properly (air should be blowing toward the engine)- 7- Inspect the fan motors or fan relays- 8- Check the radiator cap- 9- Check the thermostat- 10- Inspect the water pump- 11- Check for clogged radiator- 12- Check for plugged or deteriorated radiator hoses- 13- Check for a plugged heater core or hoses- 14- Check for a damaged cylinder head gasket- Check the radiator and A/C condenser fans are operating properly

The radiator fan does not run at high speed

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

Symptom 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

Symptom troubleshooting- Check the connectors are properly connected and the terminals are making good contact

See also:
Engine Oil Pressure Test ...161
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The radiator fan does not run at high speed
The radiator fan does not run at high speed Diagnostic Procedure 1- Radiator fan high speed circuit troubleshooting- Also check for Check the connectors are properly connected and the terminals...