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	See page
Cooling fans do not operate	Engine coolant temperature sensor	Click here
	Cooling fan motor	Click here
	No. 2 cooling fan motor	Click here
	Cooling fan circuit	Click here
	FAN relay	Click here
	Air conditioning system (for automatic air conditioning system)	Click here
	Air conditioning system (for manual air conditioning system)	Click here
	Engine room junction block assembly	Click here
	ECM	Click here
Cooling fans do not stop	Engine coolant temperature sensor	Click here
	Cooling fan circuit	Click here
	Air conditioning system (for automatic air conditioning system)	Click here
	Air conditioning system (for manual air conditioning system)	Click here
	Engine room junction block assembly	Click here
	ECM	Click here
Cooling fan speed does not change	Cooling fan circuit	Click here
	FAN relay	Click here
	Engine room junction block assembly	Click here
	ECM	Click here