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you can check the cooling fan by disconnecting the plug at the motor and run jumper wires from the battery directly to the fan motor it should run if its working if it doesn`t run then the cooling fan motor needs replacing. if it does run then check the plug for a bad connection. other things can cause this like the cooling fan relay, the coolant sensor that sends a signal for the computer to turn on the cooling fan by sending a signal to the relay.
FIRST OF ALL I WOULD REPLACE THERMOSTAT AND RADIATOR PRESSURE CAP THEN CHECK SEE IF COOLING FAN RUNNING.WHILE CAR OVERHEATING. IF NOT CHECK COOLING FAN FUSE AND RELAY.IF ALL IS GOOD THE ENGINE COOLANT TEMPERATURE SENSOR COULD BE FAULTY.HOT WIRE SEE COOLANT FAN WORKS IF NOT, COOLING FAN MOTOR BAD NEED REPLACING.IF COOLING FAN MOTOR WORKING PROBLEM COULD BE IN FAN MOTOR WIRING OR PCM FAILED.
the cooling fan fuse is located in the main fuse panel,location of which should be in your owners manual if you have one if not call the dealer and ask.it could be the cooling fan motor itself not working or the cooling fan relay.to check the cooling fan if you disconnect the plug on the back of the motor and feed direct power and ground to the terminals of the motor.if the fan starts to work then it is okay.to change the cooling fan it is a job for a shop to do as it entails alot parts removal to get to the fan itself
the cooling fans on your car are comanded on by the engine control module which reads engine temperature from the temperature sensor . when comanded on the engine control module sends a signal to the cooling fan relays . which in turn runs the current to the cooling fans . So you might want to check the cooling fan relays and make sure the fues for the cooling fans are good and the relays .if the cooling fan fuses and relays are good it could be a problem with the fan motors or the engine control module not reading the right temperature in that case it could mean you have a problem with the temperature sensor
HOT WIRE COOLING FAN USING JUMPER WIRES TO BATTERY.IF FAN DONT RUN WHEN HOT WIRED FAN MOTOR BAD NEED REPLACING. IF FAN RUN WHEN HOT WIRED. CHECK COOLING FAN FUSE AND RELAY.IF ALL IS GOOD.YOUR ENGINE COOLANT TEMPERATURE SENSOR NOT WORKING.IT CONTROL COOLING FAN AT SET TEMPERATURE IF SENSOR OPEN OR FAULTY THE COOLING FAN WONT TURN ON.CHECK COOLING FAN WIRES FOR DAMAGE.IF ALL STILL CHECK OUT GOOD HAVE VECHICLE SCANNED FOR PCM FAULT.IF IT FAILS NO COOLING FAN WONT TURN ON.
1. check the cooling fan fuses
2. supply battery voltage directly to the fan assembly plug
a. if fan is good
locate and test/replace cooling fan relay
b. if bad
replace cooling fan assembly
if still is not working check continuity cooling fan system circuit/wiring
FIRST SCAN CAR TO SEE IF COOLANT TEMPERATURE SENSOR IS WORKING SEE IF YOU GETTING ECTS CODES. IF NOT CHECK THE COOLING FAN FUSE AND RELAY.IF BOTH GOOD HOTWIRE THE COOLING FAN USING JUMPER WIRES TO CAR BATTERY.IF FAN DONT WORK REPLACE THE COOLING FAN MOTOR ITS FAULTY.
You have two fan's on your truck, 1 is a fan clutch runs with the drive belt, 2 elec fan motor, with test light and engine running at normal temp, just a little bit above 1/2 way on your temp gauge check voltage at elec. cooling fan harness if you have voltage at one of the two wire's and fan don't turn on, bad cooling fan motor, on the fan clutch after you check voltage at elec. fan motor turn engine off, with your hand spin drive belt fan if it spin's freely bad fan clutch, replace it.Also check cooling level.Hope this was very helpful