What part do I need and how do I fix my heater? Is it the AC control module?

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My car used to blow hot air out the vents like it was stuck on auto all the time in summer and winter while driving even if the heater turned off. The control would also still work going from 1 to 4 as well. During that time my ac worked at first then stopped working as time passed. Now my heat all of a sudden does not work. The lights on my control panel for the ac and the defroster doesn't light either. Its like the whole control panel is dead where the fan blows out cold air constantly on low but does not react to the control switches from 1 to 4. nor does the temperature work from cold degrees to hot degrees (they do show the temperature numbers). I took it to Meineke repair shop and they told me it was the blower motor resistor control module but when they attempted to get the part as it was not available but at the dealer they were not able to fix it as the piece from the dealer would be a lot more. They said my car had a different resistor than the other ones something about the climate control. I ended up getting the part but the part after description and me taking the part out to show was actually the AC control module as it was different than the blower motor resistors that were being uploaded up from the auto stores. Thinking I had the problem fixed I get the used part from the junkyard, the AC control Module, and fastened and plug it back on but my heater still does not work and the control panel still is dead with no lights coming on for the ac or the defroster. Am I missing something like I need special equipment to fix it? Is it another part? Please help, its only getting colder out and I do not want to keep driving in a cold car to work. (I was told the blower motor still works)