COOLING FAN SYSTEM PROBLEM SYMPTOMS TABLE

Tip:

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.

Table 1. Cooling Fan System

Symptom

Suspected Area

See page

Cooling fan does not operate

Engine coolant temperature sensor

Click here

Cooling fan motor

Click here

FAN NO. 1 relay

Click here

Cooling fan circuit

Click here

Cooling fan ECU

Click here

ECM

Click here

Cooling fan does not stop

Engine coolant temperature sensor

Click here

Cooling fan circuit

Click here

Cooling fan ECU

Click here

ECM

Click here

Cooling fan speed does not change

Cooling fan circuit

Click here

Cooling fan ECU

Click here

ECM

Click here