'94 Cadillac deville Concourse. My winsdhield defrost fan will not shut off even when I turn the ignition off. I have to unplug the wires from the blower under the hood to get it to turn off. I have tested the hot and ground in the wire plug and they test fine. When the blower is unplugged the ac/heat also do not work. When the blower is plugged in it will not stop but I can operate the ac and heat separately meaning the ac blows cold through the dash vents and the heat blows fine depending on which I select and what temp I select.
Follow the wires from the blower motor back to the blower motor resistor, normally only a few inches away and held in by a 7 mm screw. Replace it
Bad relay go ahead and check relay. If its not the blower module may need to be replace
OK, the relay for the blower motor needs to be replaced, or the blower motor module.
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