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.

Cooling Fan System
Symptom Suspected Area Link
Cooling fans do not operate (all fans) Cooling fan circuit

Click here

Engine coolant temperature sensor

Click here

COOLING FAN NO. 3 relay (FAN NO. 3)

Click here

ECM

Click here

Cooling fan does not operate (fan) Cooling fan circuit

Click here

Cooling fan motor

Click here

COOLING FAN NO. 1 relay (FAN NO. 1)

Click here

ECM

Click here

Cooling fan does not operate (No. 2 fan) Cooling fan circuit

Click here

No. 2 cooling fan motor

Click here

COOLING FAN NO. 2 relay (FAN NO. 2)

Click here

COOLING FAN NO. 3 relay (FAN NO. 3)

Click here

ECM

Click here

Cooling fans do not stop (continue to operate) (all fans) Cooling fan circuit

Click here

Engine coolant temperature sensor

Click here

COOLING FAN NO. 3 relay (FAN NO. 3)

Click here

ECM

Click here

Cooling fan does not stop (continues to operate) (fan) Cooling fan circuit

Click here

COOLING FAN NO. 1 relay (FAN NO. 1)

Click here

ECM

Click here

Cooling fan does not stop (continues to operate) (No. 2 fan) Cooling fan circuit

Click here

ECM

Click here

Cooling fan speed does not change Cooling fan circuit

Click here

COOLING FAN NO. 2 relay (FAN NO. 2)

Click here

ECM

Click here