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That white device is the vacuum control valve for the transmission and it has a vent line. Your leak could be anywhere in the system. You need a Mity Vac to properly diagnose it. You could exclude the door lock system by disconnecting the yellow line at the firewall and plugging the line towards the vacuum pump. Then, turn off your climate control system by pushing the far right button.
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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13
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