2003 Silverado Heater Motor

So all of a sudden my heater motor won't shut off when key is turned off. Barely running but draining my battery
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Double check and make sure the fan is NOT running when the blower control is set to OFF. Then you'll know that when you remove the key, power is somehow getting to the blower motor. I guess it's possible there's a short somewhere other than the ignition cylinder, but the cylinder would be first on my list