I just did the same thing last week. The blower was starting to slow down and stop after a while. Did the R&R and it was like a NEW blower, I had never felt it blow as powerful as it does now... it actually blew a bunch of debris and dust out of the vents the first time I turned it up after the repair.
http://www.benzworld.org/forums/w123-e-ce-d-cd-td/1433494-diy-fan-blower-repair.html
http://www.benzworld.org/forums/w123-e-ce-d-cd-td/1433494-diy-fan-blower-repair.html
