Fan worked until I removed console and replaced

Is it possible that the battery has drained enough to not run the fan? I had the battery unplugged during most of the repair, but on intermittently to check that the bulbs I replaced in the gauge panel were working. Something else I read in searching this out made me think of this. I guess I may try to run the car a little to charge the battery and see what happens. I'm not optimistic about this idea. I don't see how everything else would work fine (lights don't seem to be dimmed or anything) and only the fan not turn on or even try to turn on. But at this point I've got to try every option. Luckily, I have another taurus I can take parts off of, so I'm assuming my next step is to replace the fan itself. I was going to try the controls from the parts car but it's a 2000 model and the control plugs are different for the switch. Although I think I could swap the connectors or just the dial itself.

This is a variation on the eternal question of "I worked on my car and F'd it up" "what do I do?". Since you know what you worked on, you must go back and find your mistake.

I have retraced as far as removing the console and ensuring I didn't leave anything unplugged. Wires didn't seem loose in the clips. Beyond that, the work I had done was simply removing the panels around the gauge panel, removed the gauge panel and replaced bulbs. Then put everything back in reverse. Nothing else should have related to the the heater controls except removing and reinstalling the console. I would appreciate any suggestions on what might be the cause instead of being criticized for taking the initiative to work on my own car, rather than hand it off to someone else. Some say, "No one today knows how to fix the simplest thing....", then when someone takes initiative to do something for themselves they are criticized for not taking it to a "professional".

And the answer is.... reset the computer. I saw this in another search, but it was for a 2013 Taurus and wasn't sure it would work for a 2003 model. I waited to try it in case this would cause other issues, but so far it is working. Unplugged the positive battery terminal, turned the key on as if to start, 3 times. Had to run the car a couple minutes, but the fan came on. I've lost track to where I saw the other post, but I'm thankful someone out there was kind enough to share their experience or I would still be replacing parts with no results. Hope this helps someone else.