Vacuum servos should have nothing to do with it. Sounds like plugged evaporator box drains. Locate rubber "nipples" under car on either side of trans tunnel and clear with a wire or such.
Some info. 126 evaporator cleaned (and minty fresh ;))
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The Golden Rule
1984 300SD (bought new, sold it in 1988, bought it back 13 yrs. later)
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