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 plugged or deteriorated radiator hoses.
12.
Check for a plugged heater core or hoses.
13.
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
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 high speed
A/C condenser fan high speed circuit troubleshooting.
Check the connectors are properly connected and the terminals are making good contact