is there a recall on the 2003 mercury sable

Your "board" is gone. The part is "cheap". The one went on my Malibu. Justs plugs in. Call the dealer, and try and call around to see if they have one. I paid $25 for mine. The reason that only high works is that, that setting has the least resistance. But there is no recall for this. Best of luck. Hope this helps.

Yes, the blower motor resistor block is out.  No recall on this, recalls are typically safety/emissions issues and not related to stuff like climate controls unless they would pose a fire hazard or some other problem.