I [I]know[I] that someone out there has to know where this vacuum line terminates...please save me hours of removing who knows how many panels, plates, covers and whatever to find the terminus. Does this go to a module/device in connection to the transmission? The pump activates only when the transmission is put into gear (forward or reverse). I would appreciate any help from whomever!!

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1996 SL320 97K miles
1996 C220 130k miles
1992 500SEL 170k miles <---sold
1986 300E 216k miles <---sold