What I do is take all the door panels off and check all the actuators (trunk & fuel door also) then pull the passenger side carpet up and start trouble shooting with the mity Vac.
On my newly acquired TD I found two leaking door pods, a bad selector valve in the driver door, a leaky rubber grommet where the vacuum line goes into the aft storage tank (egg crate) and the linkage disconnected in the back hatch pod. The system now holds vacuum for at least 4 or 5 cycles. Geez, no wonder the locks didn't work 
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1985 Euro 240D 5 spd 140K
1979 240D 5 spd, 40K on engine rebuild
1994 Dodge/Cummins, 5 spd, 121K
1964 Allice Chalmers D15 tractor
2014 Kubota L3800 tractor
1964 VW bug
"Lifes too short to drive a boring car"
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