Does your VIN match this ?

http://catalog.worldpac.com/mercedesshop/sophio/wizard.jsp?partner=mercedesshop&clientid=catalog.mercedesshop&baseurl=http://catalog.peachparts.com/&cookieid=23I0RAMEE24318WC7L&year=1994&make=MB&model=S-420-001&category=R&part=Climate+Control+Unit