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I am not sure about your car but on W126 all but one of the vacumm elements can be changed without taking the dash out. The one which is for the center vent is very very tough to do but still can be done with creative thinking. The 2 for the defrost are right behind the glove compartment, defrost one is on the passenger side of the console, and heat/cool air one is on the driver side of the console. They are big pain to change some of them but doable.
I hope 190e has those on similar places. Do a search a lot of information will come up.
Good luck
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87 420 SEL
Looking for a nice mid 80's MB diesel. 
87 BMW 528e (Sold)
99 TOYOTA 4Runner
1989 Honda Accord (Sold)
1988 Honda Accord (Total)
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