Have you tried the fuses? It may be that it's just blown.
Here'a a list of them all and what they do. 
http://www.saabnet.com/tsn/faq/fuses9-3.html
Looks like #19 on the instrument panel and  #5 in the engine bay are A/C-related. 
Fingers crossed
                
 Richard
                
 June 2009