Where are you located ?
If there is another owner near, try putting your module in their car.
If you don't know anyone close, send it to me and I'll see if it works in mine.
( send me a PM for address / phone )

BTW, it's called an FCM, or Fan Control Module.

here's one on fleabay the 'say' works, and it's pretty cheap :
http://www.ebay.com/itm/Mercedes-Benz-CLK320-Auxiliary-Cooling-Fan-Control-Module-OEM-A-0255455932/252038845453?_trksid=p2047675.c100011.m1850&_trkparms=aid%3D222007%26algo%3DSIC.MBE%26ao%3D1%26asc%3D29979%26meid%3Dd4e8c8dc595c42409d565c64f433b286%26pid%3D100011%26rk%3D5%26rkt%3D10%26sd%3D191603436593