Be sure to check the strip fuse that is located on or near the drivers side strut tower. It is a small box about an inch by two. Open it and with the car and blower off (fuse cooled off), push on it, if it breaks, it was at fault. The regulator for the blower is located under the blower motor and is pretty difficult to replace not to mention expensive.

------------------
Benzmac:
ASE CERTIFIED MASTER AUTO TECHNICIAN
SERVICE MANAGER FOR 14 BAY FACILITY
MERCEDES SPECIALIST 8 YRS
PARTNER IN MERCEDESSHOP.COM