How do you remove the wiper arm assy on a 1990 190e 2.6 to gain access to blower motor?

1. raise hood to full open position. 2. remove negative (ground) cable from battery. 3. remove black plastic leaf screen and rubber strip that run across the bottom of the windshield and top of engine firewall. there are a couple of plastic screws that hold the screen in place. the blower cover is now visible below the centre of the windshield as a black plastic housing with a couple of gentle torpedo shaped bulges in it and two narrow vertical metal straps down the front. 4. remove 6 small sheet metal bolts (3 down each side) that hold the top section of the metal firewall behind the engine in place. push the section gently but firmly towards the engine an inch or so. 5. remove the wiper motor and arm assembly by removing a handful of small bolts and nuts (all 10 mm heads). unplugging the wiring is not necessary. set aside the whole wiper assembly - on top of the engine is as good a place as any (but don't close the hood on it!) if u have any climatic control questions u can visit my tutorial at http://www.benzworld.org/forums/w201-190e-d-class/1358590-troubleshooting-Mercedes-Benz-190-e-d-210-tempmatic-climate-control-system.html