98 Buick Century, the heat and/or A/C has completely stopped blowing. The screen on the digital display stopped working a long time ago but everything still worked. Now that it's stopped working I took it to a Goodyear and they have no idea. Their best guess is the heat and A/C control unit has stopped working. Is the control panel with the digital display what they're referring to and is it possible to get it and get it programmed somewhere else than a dealer?