THE 2 FRONT FANS DO NOT TURN ON WHEN THE AC IS TURNED ON AND THE VEHICLE OVERHEATS. AS LONG AS YOU KEEP AC OFF VEHICLE IS FINE. THERE IS NO POWER TO FANS AND WE HAVE CHECKED ALL THE FUSES. WE HAVE CHECKED THE FANS AND THEY ARE OPERABLE HOW DO WE FIX THIS?
Hi. here are a few steps that will help you troubleshoot this fan issue you are experiencing.
Step1
Check for broken wires or loose connectors around the fan circuit.
Inspect connectors at the fan motor, relay, sensor or heat sensitive
switch, and the Electronic Control Module (ECM)--your car’s
computer control system. Also, make sure to check for a possible blown
fan fuse. These are common and overlooked troublesome spots that may
cause a fan to fail.
Step2
Run and bring the engine to warm temperature. With the engine running, use a voltage test light to check for power
to the motor fan. Be extra careful and make sure to keep your hands and
tools away from the belt, fan or any other engine moving parts. If
voltage is reaching the fan motor, the test light should glow.
Step3
Turn off the engine
after you see the light glow. Apply direct voltage to the fan motor
from your car battery using a pair of spare wires. If the fan fails to
operate, replace the fan motor. If the motor operates, your problem is
in the motor connector.
Step4
Locate the heat-sensitive switch or heating sensor if the fan motor
operates with direct voltage and the test light did not glow. You
should find the sensor in the radiator, engine block, or thermostat
housing.
Step5
Measure the resistance across the heating sensor with the multimeter.
With the engine at cool temperature (engine off), it should register
infinite resistance; with the engine at warm temperature (engine off),
you should read low resistance. If both readings state infinite
resistance install a new heating sensor, that’s the cause of your
failing fan.
Step6
Check the action of the fan relay if the heating sensor is registering
variable resistance. Your service manual should specify the power and
ground wires according to color codes and the proper way to test it. If
the fan relay fails the test replace it with a new one.
Step7
Check the connections going to the ECM after you determine the fan
relay is working properly. If you find broken wires or loose
connectors, make the necessary repairs. If you suspect a defective ECM
take your vehicle
to a service shop for a computer analysis. In most cases, the ECM is
rare to be the cause of a failing fan. The above steps should take you
to the root cause of your problem and help you fix the cooler fan.
Please rate and god bless.
TIPS AND PRECAUTIONS.Most
automotive service manuals will show the wiring diagrams for the
different electrical and electronic system components. Having the
service manual for your car handy to locate components and look up
specifications will make your troubleshooting task much easier.A
service manual can be purchased at most auto part stores. Also, most
public libraries maintain an updated section of automotive service
manuals that you can consult free of charge.Keep
your hands away from the fan, belts, or any other moving parts while
working on your engine, they can easily catch and rip through your
fingers, hands and arms.Always
wear short sleeve shirts and avoid wearing jewelry or watches while
working on your car engine, especially while the engine is running.
Clothes and jewelry can get trapped in moving engine parts and cause
severe injury.
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Hello,good day,you mention all the possible cause,your aux. fan relay should also check,in your fuse box,remove the plastic cover,check relay for fan mark with letter d (1st stage) and c (2nd stage)then try to remove the connection of your fan,check if connector 1 (white and black) have power,connector 2 (brown) should have ground connection, if not check your relay,i'm looking the wiring diagram,it's only the relay or fuse is defective,ty
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The car overheats after operating for sometime with the AC on. Looked at the cooling fan operation and the fan never came on when the AC was turned off. Disconnected the temp sensor and jumped it and the cooling fan still did not come on. Looked at the fuses under the car hood and inside of the cabin in the drivers side and all appear okay. The cooling fan is electric which discarted a fan clutch assembly. I think that the problem is electric as it comes on when the AC is turned on. Again after sometine of the car operating with the AC on , the AC is drop off line and the car starts overheating.
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