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Anyone ever had this problem?

I shut the car off and pull the key and the heater/AC fan continues to run. I have pulled all relays and/or fuses in the center console and the under hood relay center and it still runs. 

  The manual shows a power module and the heat/AC solid state control  units as the likely suspects. 

When I unplug the battery I hear a relay clicking from under the dash and it starts back up again.  Hmmm.......

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It's most likely the blower control module causing the problem. I've heard of the module failing and causing the blower to run several times.

 

Try unplugging it and see if the blower motor stops.

 

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Edited by Ronnie (see edit history)
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Commom problem. Good news is all of the GM cars of the era with ATC that I've seen have that same module so is easy to find.

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