COOLING FAN SYSTEM PROBLEM SYMPTOMS TABLE

Tech Tips


  • Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes of the symptoms are listed in order of probability in the "Suspected Area" column of the table.

    Check each symptom by checking the suspected areas in the order they are listed. Replace parts as necessary.

  • Inspect the fuses related to this system before inspecting the suspected areas below.

Cooling Fan System
Symptom Suspected Area Link
Cooling fans do not operate (main and sub fans) Cooling fan circuit

Click here

FAN No. 3 relay (FAN NO. 3)

Click here

Engine coolant temperature sensor

Click here

Cooling fan motor

Click here

No. 2 Cooling fan motor

Click here

ECM

Click here

Cooling fan does not operate (main fan) Engine coolant temperature sensor

Click here

Cooling fan circuit

Click here

FAN No. 1 relay (FAN NO. 1)

Click here

Cooling fan motor

Click here

ECM

Click here

Cooling fan does not operate (sub fan) Cooling fan circuit

Click here

No. 2 Cooling fan motor

Click here

FAN No. 2 relay (FAN NO. 2)

Click here

FAN No. 3 relay (FAN NO. 3)

Click here

ECM

Click here

Cooling fans do not stop (main and sub fans) Cooling fan circuit

Click here

FAN No. 3 relay (FAN NO. 3)

Click here

ECM

Click here

Cooling fan does not stop (main fan) Engine coolant temperature sensor

Click here

Cooling fan circuit

Click here

FAN No. 1 relay (FAN NO. 1)

Click here

ECM

Click here

Cooling fan does not stop (sub fan) Cooling fan circuit

Click here

ECM

Click here

Cooling fan speed does not change Engine coolant temperature sensor

Click here

Cooling fan circuit

Click here

FAN No. 2 relay (FAN NO. 2)

Click here

ECM

Click here