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turning of the ac switch will indicate if it is an ac problem for the fans.
some cars have the radiator fans running for up to 10 minutes after shut down . Run the fault codes to see if there is a faulty temperature sensor. how it works is this
the sensor is connected to the ecm and has power passing through. it When the sensor sensor a preset coolant temperature the power to the ECM is altered and so the ECM energizes the relays for the fans. If the fans are running continuously after shut down then the ECM still has the relays energized as it is still reading the requirement from the sensor.
I dont know what year model you have but the newer one will run when car is turned off to cool radiator. Maybe you have a radiator problem if this just started to happen. Is the car over heating. Did you check radiator fluid or thermostat. I dont know much about your car and year model but i would do these checks. Maybe radiator needs to be flushed. You can use aluminum brite for to flush. Can buy it at O Reiley's. I had to flush my daughters radiator about 10 times when we bought it used, fithy. Looks brand new. Please dispose of chemicals properly. It is an acid.
Hi, If your radiator fan not working change fan switch. If you know where is the fan switch disconnect it and see if the fan work when you put car on. If not check the fusem, fan relay and fan power problem.
I don't think it has one. Mine would fail due to the thermo switch in the base of the radiator. It has two heavy wires coming from it. Touch them together and see if the fan runs. If it does, replace that- if not see if it is getting power to one of the wires.(key on). If not- track the wire that does not go to the fan and see where the power should be coming from.
You might try tracing the ground wire to the fan also.
Radiator fan fuse is fuse # 5 (40 amp/Green) located behind the interior fuse access panel on the left side of the instrument panel next to the steering column. Also, in the underhood Power distribution center, next to the air cleaner filter are two black fan relays: high speed (F) at the far left, second row down and a low speed, 1st one to the right on the bottom row.
This really sounds like your radiator fan is working. Slow speeds under 20MPH the fan is needed badly. Over 20MPH there is enough ram air to sufficiently cool down the radiator. You should find a fuse for it in the Power Distribution Center under the hood. Check big and small. If the fuses are good and you're convinced the radiator fan isn't coming on, try swaping the rad fan relay with another in the PDC. As far as the "Check engine" lite goes, a transmission fault can turn on the lite. However if your radiator fan is not working that will also turn on the "Check engine" lite.
Good luck with that and let me know if you still have issues.