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my fan motor comes on intermittently
on 2010 Chevrolet Impala

every once in awhile the fan motor starts to blow and when it happens i have to unplug the 30 amp fuse under the hood to make it stop.

Asked by for the 2010 Chevrolet Impala
If your vehicle has Automatic Climate control, then you probably have a failed Blower Control Module. They contain a transistor that can short out and keep the fan powered up, even with the key off.