After doing a search on this site for you using the search feature above, here is how to do it:
Posted by daveCT on 02-18-2003 10:01 PM:
just changed mine in a 86 190e 16v
it takes about 30 min ,with a 8mm, 10mm ,13mm,and a screwdriver , first, grill comes out (4 , 5 nuts), the wiper linkage must come out, few bolts , slides out from passager side, blower box has 6 metal straps that pry's off easy, motor has one metal clip , pry's off easy, drop the motor in plug in , off you go.
190E Blower Motor Replacement