No problem. I think I have everything I need for the AC system I'm putting in and no need for the extra rheostat. It's good you guys ID'd it because it confirms my suspicion that this was originally an AC rig.
Sorry Delancy, the only part that is still on the rig was that rheostat and the firewall coupler for the coolant lines. They didn't even leave me the bracket so I'm accumulating the pieces to build a new AC system and I've managed to snag the factory under dash components. If I find anything else when I tear apart the remaining gear under the dash then I may have some spare parts. Who knows? Maybe there's still an evaporator unit under there, I am not familiar with the dealer installed units and my first one had a factory unit so I don't know if my system is a non-AC stock one or not.