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Fan will not turn off, even after removing the key

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Some cooling fans run even after the enginr shuts off, so that the temp is lowered. If it stays on all the time, then you might have a switch, sensor or relay problem

Posted on Oct 12, 2010


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2003 suburban with a fan that will not turn off after turning off ignition and taking keys out. still blowing

Could be a bad ignition module (key switch) but more likely than not you fried a relay and your fan relay is providing constant hot to your fan. Swap the relay with another one in your system (or with a spare if you have one).

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You could have a bad relay for the fan or the sensor that sends a signal to turn the fan on is "wanting the fan to stay on. It don't know to turn off.

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You have a relay sticking ,replace it and it will go back to normal

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if you changed the sensors on the head , then the fan temp sending unit on the fan assembly is faulty. it's sending a false reading to the computer therefore keeping the fans running replace this and the proble will be resolved

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A/c fan will not turn off when i turn off the car

If I understand you right, your saying that your blower still runs, even after you turn off the vehical and remove the keys??? If thats the case, the only thing it could possibly be is the eletrical side of your ignition switch. Whats happening is that when you turn the car off, the switch is not disconnecting. Try this. After you turn off the car, and the blower is still working, remove the keys, try turning on your turn blinker. That should not work if the cars off. If it works, I would say its the switch. If it does not.....well...Im not sure. Hard to solve problems with out seeing. Good luck. John..

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1 Answer

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you either have a short in the wiring .... which hopefully would have blown a fuse... or the relay for the fan needs replacing.


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