Latest issue of the newsletter is out, I drone on about my HVAC woes. I included an illustrated install of the pushbutton unit. You really don't need picures for this repair ,as it pretty intuitive to begin with, but it's there regardless. Have a peek at the rest of the newsletter too. If you are not subscribed, go ahead and sign up, its free :) I promise i won't bite.
http://MercedesDot.com "The Poor Man's Mercedes Newsletter

Alex