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Why does my Radiator fan turn on when cold/hot?

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Old Jan 31, 2013, 02:53 PM
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Why does my Radiator fan turn on when cold/hot?
So lately one of my radiator fans turns on as soon as the ignition is switched on. The engine could be cold or hot. Has never done this before just recently last week it started doing it. Any help as to why?
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Old Jan 31, 2013, 07:13 PM
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The ECM tells the fan when and how fast to run so it could be that.
The engine temperature sensor tells the ECM when the engine is hot so it could be that.
And, there is the controller on the fan.
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Old Feb 1, 2013, 07:44 PM
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So how can I know who's at fault? Lol
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Old Feb 1, 2013, 08:28 PM
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Is it constantly on? If so then it's getting switched 12v power.... Maybe the ground wire shorted to earth? Not too familiar with the wiring of the fans so take my advice lightly.
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Old Feb 1, 2013, 09:23 PM
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Of your AC is on it will come on right away. If your defrost is on the ac is automatically on.
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