Having some issues with my blower motor and blower control module. I have the dual climate control. So I went to start my truck and it starts up as usual but the fan would not blow any air through the vents. So I figured I'd just need a new module but later that night I go into my truck and the fan is blowing air through the vent on high no key in the ignition at all but when I turn it on it shuts off. Any insight on why it might be reversed?